Publications by authors named "Ryotaro Tani"

19 Publications

  • Page 1 of 1

Diffuse large B-cell lymphoma in the liver accompanied by primary biliary cholangitis: A rare and difficult-to-diagnose tumor with portal venous thrombosis.

Int J Surg Case Rep 2021 May 30;82:105936. Epub 2021 Apr 30.

Department of Surgery, Shiga General Hospital, Moriyama, 5-4-30 Moriyama, Moriyama, Shiga 524-8524, Japan. Electronic address:

Introduction And Importance: The most common liver malignancies are hepatocellular carcinoma, intrahepatic cholangiocarcinoma, and metastatic tumors. Hepatocellular carcinoma and intrahepatic cholangiocarcinoma may invade the portal vein (PV). An association between diffuse large B-cell lymphoma (DLBCL) and primary biliary cholangitis (PBC) remains unclear. We herein report a thought-provoking case of a difficult-to-diagnose liver tumor with PV thrombosis in a PBC patient.

Presentation Of Case: A 66-year-old woman had PBC, systemic sclerosis, diabetes, and osteoporosis. A solitary liver tumor accompanied by macrovascular thrombosis in the PV was detected incidentally. Based on dynamic imaging findings, we considered the tumor to be intrahepatic cholangiocarcinoma, and right lobectomy with lymphadenectomy was performed. Unexpectedly, pathological assessment made a definitive diagnosis of DLBCL that did not invade the vessels and bile duct. In fluorine-18-fluorodeoxyglucose positron emission tomography, abnormal accumulations were clearly observed in the breast tissue and peritracheal, parasternal, mediastinal, and pericardial lymph nodes. The patient achieved complete remission after systemic chemotherapy, and there has been no recurrence 3 years after surgery.

Clinical Discussion: Primary lymphoma in the liver is rare, and we did not consider our patient's tumor as primary liver lymphoma. Our case actually showed no tumor thrombosis in the PV. Although autoimmune disorders may increase the risk of non-Hodgkin's lymphoma, an association between DLBCL and PBC is still unclear, and we must remember that DLBCL may develop rarely in a PBC patient.

Conclusion: Our case report provides a timely reminder for clinicians and surgeons in the fields of hepatology and hematology.
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http://dx.doi.org/10.1016/j.ijscr.2021.105936DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8114119PMC
May 2021

Fatal arterial hemorrhage after pancreaticoduodenectomy: How do we simultaneously accomplish complete hemostasis and hepatic arterial flow?

World J Hepatol 2021 Apr;13(4):483-503

Department of Surgery, Shiga General Hospital, Moriyama 524-8524, Shiga, Japan.

Background: Although arterial hemorrhage after pancreaticoduodenectomy (PD) is not frequent, it is fatal. Arterial hemorrhage is caused by pseudoaneurysm rupture, and the gastroduodenal artery stump and hepatic artery (HA) are frequent culprit vessels. Diagnostic procedures and imaging modalities are associated with certain difficulties. Simultaneous accomplishment of complete hemostasis and HA flow preservation is difficult after PD. Although complete hemostasis may be obtained by endovascular treatment (EVT) or surgery, liver infarction caused by hepatic ischemia and/or liver abscesses caused by biliary ischemia may occur. We herein discuss therapeutic options for fatal arterial hemorrhage after PD.

Aim: To present our data here along with a discussion of therapeutic strategies for fatal arterial hemorrhage after PD.

Methods: We retrospectively investigated 16 patients who developed arterial hemorrhage after PD. The patients' clinical characteristics, diagnostic procedures, actual treatments [transcatheter arterial embolization (TAE), stent-graft placement, or surgery], clinical courses, and outcomes were evaluated.

Results: The frequency of arterial hemorrhage after PD was 5.5%. Pancreatic leakage was observed in 12 patients. The onset of hemorrhage occurred at a median of 18 d after PD. Sentinel bleeding was observed in five patients. The initial EVT procedures were stent-graft placement in seven patients, TAE in six patients, and combined therapy in two patients. The rate of technical success of the initial EVT was 75.0%, and additional EVTs were performed in four patients. Surgical approaches including arterioportal shunting were performed in eight patients. Liver infarction was observed in two patients after TAE. Two patients showed a poor outcome even after successful EVT. These four patients with poor clinical courses and outcomes had a poor clinical condition before EVT. Fourteen patients were successfully treated.

Conclusion: Transcatheter placement of a covered stent may be useful for simultaneous accomplishment of complete hemostasis and HA flow preservation.
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http://dx.doi.org/10.4254/wjh.v13.i4.483DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8080554PMC
April 2021

Aggressive Resection of Malignant Paraaortic and Pelvic Tumors Accompanied by Arterial Reconstruction with Synthetic Arterial Graft.

Am J Case Rep 2021 May 1;22:e931569. Epub 2021 May 1.

Department of Surgery, Shiga General Hospital, Moriyama, Shiga, Japan.

BACKGROUND Advanced malignancies in the lower abdomen easily invade the retroperitoneal and pelvic space and often metastasize to the paraaortic and pelvic lymph nodes (LNs), resulting in paraaortic and/or pelvic tumor (PPT). CASE REPORT A total of 7 cases of aggressive malignant PPT resection and orthotopic replacement of the abdominal aorta and/or iliac arteries with synthetic arterial graft (SAG) were experienced during 16 years. We present our experience with aggressive resection of malignant PPTs accompanied by arterial reconstruction with SAG in detail. The primary diseases included 2 cases endometrial cancer and 2 cases of rectal cancer, and 1 case each of ovarian carcinosarcoma, vaginal malignant melanoma, and sigmoid cancer. Surgical procedures are described in detail. Briefly, the abdominal aorta and iliac arteries were anastomosed to the SAG by continuous running suture using unabsorbent polypropylene. Five Y-shaped and 2 I-shaped SAGs were used. This en bloc resection actually provided safe surgical margins, and tumor exposures were not pathologically observed in the cut surfaces. Graphical and surgical curability were obtained in all cases in which aggressive malignant PPT resections were performed. The short-term postoperative course of our patients was uneventful. From a vascular perspective, the SAGs remained patent over the long term after surgery, and long-term oncologic outcomes were satisfactory. CONCLUSIONS To our knowledge, this case series is the first report of aggressive malignant PPT resection accompanied by arterial reconstruction with SAG. This procedure is safe and feasible, shows curative potential, and may play a role in multidisciplinary management of malignant PPTs.
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http://dx.doi.org/10.12659/AJCR.931569DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8097745PMC
May 2021

Adrenocorticotropic hormone-dependent hypercortisolism caused by pancreatic neuroendocrine carcinoma: A thought-provoking but remorseful case of delayed diagnosis.

Int J Surg Case Rep 2021 Apr 5;81:105729. Epub 2021 Mar 5.

Department of Surgery, Shiga General Hospital, Moriyama, 5-4-30 Moriyama, Moriyama, Shiga, 524-8524, Japan. Electronic address:

Introduction And Importance: Definitive diagnosis of functioning neuroendocrine neoplasms (NENs) in the pancreas is challenging. Adrenocorticotropic hormone (ACTH) regulates adrenal cortisol production. Ectopic ACTH secretion by functioning NENs may cause hypercortisolism.

Presentation Of Case: A 62-year-old woman who was receiving medications for hypertension and hyperlipidemia was referred to our hospital because of abnormal blood tests. Diabetes mellitus was initially diagnosed. Dynamic computed tomography and endoscopic ultrasound revealed a 35-mm diameter hypovascular tumor in the distal pancreas and multiple liver metastases. Endoscopic ultrasound-guided fine-needle aspiration resulted in a diagnosis of neuroendocrine carcinoma. The patient developed pancreatic leakage progressing to peritonitis, abscess formation, pleural effusion, and ascites after the fine-needle aspiration biopsy. Her clinical condition deteriorated to a septic state, necessitating emergency surgery comprising distal pancreatectomy, intraperitoneal lavage, and drainage. Wound healing was protracted and accompanied by ongoing high white blood cell counts and neutrophilia. She also developed a gastric ulcer postoperatively. Systematic endocrine investigations were performed because hypercortisolism caused by a functioning NEN was suspected. Eventually, a definitive diagnosis of an ACTH-producing NEN in the pancreas was made. Systemic chemotherapy was proposed; however, the patient and her family opted for palliative treatment only. She died 42 days after the initial diagnosis.

Clinical Discussion: We here present a patient with ACTH-dependent hypercortisolism attributable to a pancreatic NEN who died of progressive cancer after a delay in definitive diagnosis.

Conclusion: Detailed investigation, including systematic endocrine examination and functional imaging studies, are important for precise diagnosis of, and appropriate treatment for, NENs.
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http://dx.doi.org/10.1016/j.ijscr.2021.105729DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7957145PMC
April 2021

Acute intestinal infarction caused by initially unexplained splanchnic venous thromboses in a patient with protein C deficiency: A thought-provoking emergency case.

Int J Surg Case Rep 2021 Feb 22;79:390-393. Epub 2021 Jan 22.

Department of Surgery, Shiga General Hospital, 5-4-30 Moriyama, Moriyama, Shiga, 524-8524, Japan. Electronic address:

Introduction And Importance: Splanchnic venous thrombosis (SVT) originating in the superior mesenteric vein (SMV) is rare and may cause acute intestinal infarction (AII). Protein C deficiency (PCD) results in thrombophilia.

Presentation Of Case: Acute unexplained SVT originating in the SMV and portal vein was detected in 68-year-old man. Pan-peritonitis and AII were diagnosed and emergency surgery performed. Part of the small intestine was necrotic and partial resection without anastomotic reconstruction was performed. Heparin was administered intravenously continuously from postoperative day (POD) 1. Hereditary, heterozygous, type 1 PCD was diagnosed postoperatively. The anastomosis was reconstructed on POD 16. Warfarin was substituted for heparin on POD 22. No recurrent thrombosis occurred during 2 years of follow-up.

Clinical Discussion: Patients with the rare condition of SVT require prompt diagnosis and treatment and may have underlying disease. PCD can cause SVT even in intact veins and anticoagulation therapy should be administered immediately postoperatively. Misdiagnosis and/or delayed treatment of SVT can result in AII, a life-threatening condition with a high mortality rate. Insufficient clinician awareness can result in serious mismanagement of patients with PCD and SVT; emergency patients with AII caused by unexplained SVT should therefore be further investigated for prothrombotic states and assessment of coagulation-fibrinolysis profiles to clarify the underlying mechanism.

Conclusion: We here present a thought-provoking emergency case of AII associated with acute SVT caused by underlying PCD that was successfully treated by two-stage surgery and anticoagulation therapy. This case provides a timely reminder for emergency clinicians and gastrointestinal surgeons.
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http://dx.doi.org/10.1016/j.ijscr.2021.01.071DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7848722PMC
February 2021

Do liver metastases from gastric cancer contraindicate aggressive surgical resection? A 14-year single-center experience.

World J Gastrointest Pharmacol Ther 2020 Nov;11(5):110-122

Department of Surgery, Shiga General Hospital, Moriyama 524-8524, Shiga, Japan.

Background: Advanced gastric cancer (GC) with liver metastasis is often characterized by multiple and bilobular metastases and may also be associated with extrahepatic metastatic lesions. Hence, many physicians consider that radical surgeries are contraindicated for liver metastases from GC (LMGC). According to the 2017 Japanese treatment guideline for GC, a smaller number of liver metastases without unresectable factors may be an indication for liver resection (LR) with curability. The actual 5-year overall survival (OS) rate ranges from 0 to 0.37.

Aim: To present the institutional indications for LR for LMGC and identify important factors for prognostic outcomes.

Methods: In total, 30 patients underwent LR for LMGC during a 14-year period, and we evaluated the clinical, surgical, and oncological findings. In all patients, radical surgery with intentional lymphadenectomy was performed for the primary GC. The median follow-up duration after the initial LR was 33.7 mo, and three patients with no recurrence died of causes unrelated to the LMGC. The OS and recurrence-free survival rates after the initial LR were assessed.

Results: Seventeen patients had metachronous LMGC. The initial LR achieved curability in 29 patients. Perioperative chemotherapy was introduced in 23 patients. The median greatest LMGC dimension was 30 mm, and the median number of LMGC was two. Twenty-two patients had unilobular LMGC. The 5-year OS and recurrence-free survival rates were 0.48 and 0.28, respectively. The median survival duration and recurrence-free duration after the initial LR were 16.8 and 8.6 mo, respectively. Twenty-one patients developed recurrence after the initial LR. Additional surgeries for recurrence were performed in nine patients, and these surgeries clearly prolonged the patients' survival. Pathological serosal invasion was an independent predictor of a poor prognostic outcome after the initial LR. Aggressive LR may be indicated for carefully selected patients with LMGC.

Conclusion: Our results of LR for LMGC seem acceptable. Additional surgeries for recurrence after the initial LR might prolong OS. Pathological serosal invasion is important for poor prognostic outcomes.
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http://dx.doi.org/10.4292/wjgpt.v11.i5.110DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7667407PMC
November 2020

Surgical treatment of gallbladder cancer: An eight-year experience in a single center.

World J Hepatol 2020 Sep;12(9):641-660

Department of Surgery, Shiga General Hospital, Moriyama 524-8524, Shiga, Japan.

Background: Gallbladder cancer (GBC) is the most common biliary malignancy and has the worst prognosis, but aggressive surgeries [., resection of the extrahepatic bile duct (EHBD), major hepatectomy and lymph node (LN) dissection] may improve long-term survival. GBC may be suspected preoperatively, identified intraoperatively, or discovered incidentally on histopathology.

Aim: To present our data together with a discussion of the therapeutic strategies for GBC.

Methods: We retrospectively investigated nineteen GBC patients who underwent surgical treatment.

Results: Nearly all symptomatic patients had poor outcomes, while suspicious or incidental GBCs at early stages showed excellent outcomes without the need for two-stage surgery. Lymph nodes around the cystic duct were reliable sentinel nodes in suspicious/incidental GBCs. Intentional LN dissection and EHBD resection prevented metastases or recurrence in early-stage GBCs but not in advanced GBCs with metastatic LNs or invasion of the nerve plexus. All patients with positive surgical margins (., the biliary cut surface) showed poor outcomes. Hepatectomies were performed in sixteen patients, nearly all of which were minor hepatectomies. Metastases were observed in the left-sided liver but not in the caudate lobe. We may need to reconsider the indications for major hepatectomy, minimizing its use except when it is required to accomplish negative bile duct margins. Only a few patients received neoadjuvant or adjuvant chemoradiation. There were significant differences in overall and disease-free survival between patients with stages ≤ IIB and ≥ IIIA disease. The median overall survival and disease-free survival were 1.66 and 0.79 years, respectively.

Conclusion: Outcomes for GBC patients remain unacceptable, and improved therapeutic strategies, including neoadjuvant chemotherapy, optimal surgery and adjuvant chemotherapy, should be considered for patients with advanced GBCs.
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http://dx.doi.org/10.4254/wjh.v12.i9.641DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7522563PMC
September 2020

Metachronous Pancreatic Metastasis from Rectal Cancer that Masqueraded as a Primary Pancreatic Cancer: A Rare and Difficult-to-Diagnose Metastatic Tumor in the Pancreas.

Am J Case Rep 2019 Nov 30;20:1781-1787. Epub 2019 Nov 30.

Department of Surgery, Shiga General Hospital, Moriyama, Shiga, Japan.

BACKGROUND Pancreatic metastasis from colorectal cancer is rare and can masquerade as primary pancreatic cancer. CASE REPORT A 70-year-old male was diagnosed with advanced rectal cancer with multiple liver metastases. After neoadjuvant chemotherapy, he underwent radical surgery for the primary tumor and hepatectomy for multiple liver metastases. Adjuvant chemotherapies and additional surgeries were subsequently required for recurrences in the liver, lung, and lymph nodes. A diffuse hypovascular nodule in the pancreatic head and a solitary liver metastasis were detected 2.5 years after the initial surgery and he accordingly underwent further chemotherapy. However, the pancreatic tumor progressed, invading the pancreatic duct and biliary tract. Obstructive jaundice finally prompted discontinuation of chemotherapy and he underwent biliary drainage. His diffuse and hypovascular tumor was clinically and radiographically diagnosed as a primary pancreatic cancer. Pancreatic resection for the pancreatic tumor and hepatectomy for the liver metastasis were performed 4.2 years after the initial surgery, achieving radiographic and surgical curative resection. Pathological examination of the surgical specimen resulted in a definitive diagnosis of metachronous pancreatic metastasis from his primary rectal cancer. Despite further chemotherapy, his general condition worsened; however, he remains alive 5.4 years after the initial surgery, with best supportive care. CONCLUSIONS Pancreatic metastasis originating from rectal cancer can masquerade as primary pancreatic cancer clinically and radiologically. Multimodality treatment is mandatory for metastatic colorectal cancer. Aggressive surgeries for pancreatic metastasis should be considered if curative resection appears possible radiographically and/or intraoperatively.
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http://dx.doi.org/10.12659/AJCR.918669DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6910167PMC
November 2019

Impact of continuous local lavage on pancreatic juice-related postoperative complications: Three case reports.

World J Clin Cases 2019 Sep;7(17):2526-2535

Department of Surgery, Shiga General Hospital, Moriyama 524-8524, Japan.

Background: Postoperative pancreatic leakage readily results in intractable pancreatic fistula and subsequent intraperitoneal abscess. This refractory complication can be fatal; therefore, intensive treatment is important. Continuous local lavage (CLL) has recently been reevaluated as effective treatment for severe infected pancreatitis, and we report three patients with postoperative intractable pancreatic fistula successfully treated by CLL. We also discuss our institutional protocol for CLL for postoperative pancreatic fistula.

Case Summary: The first patient underwent subtotal stomach-preserving pancreaticoduodenectomy, and pancreatic leakage was observed postoperatively. Intractable pancreatic fistula led to intraperitoneal abscess, and CLL near the pancreaticojejunostomy site was instituted from postoperative day (POD) 8. The abscess resolved after 7 d of CLL. The second patient underwent distal pancreatectomy. Pancreatic leakage was observed, and intractable pancreatic fistula led to intraperitoneal abscess near the pancreatic stump. CLL was instituted from POD 9, and the abscess resolved after 4 d of CLL. The third patient underwent aneurysmectomy and splenectomy with wide exposure of the pancreatic parenchyma. Endoscopic retrograde pancreatic drainage was performed on POD 15 to treat pancreatic fistula; however, intraperitoneal abscess was detected on POD 59. We performed CLL endoscopically the transgastric route because the percutaneous approach was difficult. CLL was instituted from POD 63, and the abscess resolved after 1 wk of CLL.

Conclusion: CLL has therapeutic potential for postoperative pancreatic fistula.
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http://dx.doi.org/10.12998/wjcc.v7.i17.2526DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6745316PMC
September 2019

Treatment of Labial Fistula Communicating with the Duodenal Stump After Gastrectomy.

Am J Case Rep 2019 Jun 16;20:851-858. Epub 2019 Jun 16.

Department of Surgery, Shiga General Hospital, Moriyama, Shiga, Japan.

BACKGROUND Anastomotic failure after gastroenterological surgery is usually treated by intraperitoneal drainage and a mature ductal fistula. A ductal fistula may develop into a labial fistula. Although a ductal fistula is controllable, a labial fistula is intractable. We report a case of a labial fistula that communicated with the duodenal stump after gastrectomy. This condition was successfully treated by intraluminal drainage with continuous suction (IDCS) via a rectus abdominis musculocutaneous flap (RAMF). CASE REPORT A 70-year-old male underwent distal gastrectomy with intentional lymphadenectomy because of advanced gastric cancer. Digestive reconstruction was completed by the Billroth II method. Pancreatic leakage, intraperitoneal abscess, and anastomotic failure of gastrojejunostomy occurred after surgery. The duodenal stump was ruptured at postoperative day (POD) 26, and ductal fistula associated with the duodenum was observed. Unfortunately, this ductal fistula developed into a labial fistula at POD 90, and a high output of duodenal juice was observed. Additional surgery was proposed at POD 161. The broken stump and labial fistula were covered by a pedunculated RAMF, and a dual drainage system (a combination of a Penrose drain and a 2-way tube) travelled through the RAMF. The tip position of the drainage system was located in the duodenum, and the IDCS was effectively introduced. The secondary ductal fistula finally matured through the RAMF, and was subsequently closed at POD 231. The intractable labial fistula was successfully treated, and the patient was discharged at POD 235. CONCLUSIONS A high-output labial fistula, which communicated with the duodenal stump after gastrectomy, was refractory in our patient. Effective IDCS through an RAMF was useful for replacement of the labial fistula with a secondary ductal fistula.
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http://dx.doi.org/10.12659/AJCR.915947DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6590267PMC
June 2019

Thoracoscopic Oesophagectomy Using Prone Positioning for Oesophageal Cancer With Right Aortic Arch: A Case Report.

Anticancer Res 2019 Jun;39(6):3207-3211

Department of Gastroenterological Surgery, Tokushima Red Cross Hospital, Tokushima, Japan.

Background/aim: Right aortic arch (RAA) is a rare abnormality of the aortic arch that forms a vascular ring. Oesophageal cancer (EC) accompanied with RAA is even rarer, and in such cases, it is very important to understand the anatomical structure in the upper mediastinum in order to perform a safe and curative operation.

Patients And Methods: A 67-year-old man who presented with pharyngeal discomfort was admitted to our hospital. Further examinations revealed advanced thoracic EC accompanied with RAA and aortic diverticulum.

Results: After neoadjuvant chemotherapy, we successfully and safely performed thoracoscopic oesophagectomy and lymphadenectomy using the prone positioning.

Conclusion: There exist only a few reports of thoracoscopic oesophagectomy for EC with RAA. Sufficient preoperative preparation and sharing an adequate strategy for the surgical approach with the surgical team are definitely necessary. Although the thoracoscopic approach for EC with RAA is useful, more considerations are needed for some issues.
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http://dx.doi.org/10.21873/anticanres.13460DOI Listing
June 2019

Severely Calcified True Aneurysm: A Thought-Provoking Case of Solitary Origin and Postoperative Management.

Am J Case Rep 2019 Apr 29;20:620-627. Epub 2019 Apr 29.

Department of Surgery, Shiga General Hospital, Moriyama, Shiga, Japan.

BACKGROUND Visceral arterial aneurysms are rare. Most splenic arterial aneurysms (SAAs) are saccular and are in the distal third of the splenic artery. Suggested major causes of SAAs are atherosclerosis, pregnancy, and inflammation. We report the case of a patient who with a SAA extending almost the full length of his splenic artery. CASE REPORT A solitary true aneurysm that extended almost the entire length of the splenic artery was incidentally detected in an asymptomatic 70-year-old male patient with a history of myasthenia gravis and diabetes mellitus. His SAA was severely calcified, but other arteries showed no calcification. The aneurysm had been slightly enlarged toward the celiac artery for 2 years, and aneurysmectomy and splenectomy were performed. Vascular clips were carefully placed at the intact splenic artery without disturbing arterial flows from the celiac artery. Arterial branch from the SAA was ligated at an intact area, and the pancreatic capsule was densely adherent with the calcified aneurysm wall. The pancreas was preserved, although the pancreatic parenchyma was widely exposed during aneurysmectomy. Pathological examination revealed no atherosclerotic changes. Postoperatively, a pancreatic fistula developed, which was treated by placing an intraperitoneal drain and retrograde pancreatic drainage tube. Nevertheless, the intractable pancreatic fistula triggered a bacteriogenic infection, resulting in intraperitoneal abscess. Continuous local lavage via transnasal continuous infusion and endoscopic transgastric drainage was performed, until the fistula closed. He was healthy at 9 months after surgery. CONCLUSIONS A SAA that had the rare form and solitary origin was treated. Continuous local lavage has a therapeutic potential for a pancreatic juice-related bacteriogenic complication.
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http://dx.doi.org/10.12659/AJCR.915010DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6501733PMC
April 2019

Inferior Pancreaticoduodenal Artery Aneurysm Related with Groove Pancreatitis Persistently Repeated Hemosuccus Pancreaticus Even After Coil Embolization.

Am J Case Rep 2019 Apr 22;20:567-574. Epub 2019 Apr 22.

Department of Surgery, Shiga General Hospital, Moriyama, Shiga, Japan.

BACKGROUND Aneurysm of the inferior pancreaticoduodenal artery (IPDA) is rare among visceral artery aneurysms. Aneurysm and/or pancreatitis may have a causal relation with hemosuccus pancreaticus (HP). HP causes an obscure bleeding in the digestive tract, and this rare disease may lead to life-threatening condition. Although interventional radiology is generally employed as the initial treatment for visceral aneurysms, aneurysmic recanalization is a critical problem. CASE REPORT A 58-year-old male was incidentally diagnosed as groove pancreatitis, and his pancreatitis was successfully treated by conservative management. One year later, an IPDA aneurysm was detected in image studies. Gastrointestinal bleeding was objectively observed, and a diagnosis of asymptomatic HP was made. Arterio-pancreatic duct fistula was suspected, but was not identified. Coil embolization was successfully completed. Six months later, he suffered a relapse of HP, and visited our emergency unit. Pseudocystic lesion around metallic coils were confirmed. Subtotal stomach-preserving pancreaticoduodenectomy without any extended resections was performed. Intentional dissections of nerve plexuses and lymph nodes were all waived. Even a pancreatography of the resected specimen did not clarify his arterio-pancreatic duct fistula. He was discharged at postoperative day 10, and smoothly returned to his work. CONCLUSIONS Pancreatic juice-related complications after advanced pancreaticoduodenectomy for malignancies are often intractable. However, simple pancreaticoduodenectomy which omits extended resections and intentional dissections is safe and feasible for benign diseases. After the initial interventional radiology for pancreatic aneurysms, an elective pancreatic surgery should be considered to avoid unwanted recanalization and refractory HP.
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http://dx.doi.org/10.12659/AJCR.914832DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6489418PMC
April 2019

Assessment of cytotoxicity and mutagenicity of exfoliated graphene.

Toxicol In Vitro 2018 Oct 19;52:195-202. Epub 2018 Jun 19.

Research Institute of Science for Safety and Sustainability (RISS), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8569, Japan; Technology Research Association for Single Wall Carbon Nanotubes (TASC), Tsukuba, Ibaraki, Japan.

Graphene and related materials (GRMs) have unique optical and thermal characteristics and are expected to be adopted for industrial applications. However, there are concerns with respect to their safety to human health. To conduct cytotoxicity and mutagenicity assessments, exfoliated graphene (EGr) dispersed in Tween-20® was diluted in cell culture medium. Rat alveolar macrophage viability significantly decreased after 24 h exposure to 1 and 10 μg/mL EGr. No significant levels of intracellular reactive oxygen species were detected in the 2',7'-dichlorodihydrofluorescin diacetate assay after 24 h of exposure to EGr. The levels of the pro-inflammatory cytokines macrophage inflammatory protein-1α, interleukin (IL)-1β, IL-18, macrophage chemoattractant protein-1, and tumor necrosis factor α were significantly higher in cells treated with 10 μg/mL EGr for 24 h than in untreated controls. Transmission electron microscopy confirmed that EGr was present in the cytoplasm of the cells. Many genes were upregulated by EGr treatment, and significantly overrepresented gene ontology categories included the biological processes "response to external stimulus", "response to stress", "cell-cell signaling", "biological adhesion", and "cell proliferation". EGr did not induce genetic mutations in E. coli or cause micronucleus induction in mouse bone marrow cells. The results suggest that EGr cytotoxicity should be carefully considered.
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http://dx.doi.org/10.1016/j.tiv.2018.06.016DOI Listing
October 2018

Mesh-Airtight-Preperitoneum: a simple method for confirming mesh placement in transabdominal preperitoneal repair of inguinal hernia.

J Med Invest 2016 ;63(3-4):270-3

Tokushima Red Cross Hospital, Department of Digestive Surgery.

We devised a method for confirming the position of mesh placed during transabdominal preperitoneal repair (TAPP) of an inguinal hernia. The preperitoneum is sufficiently detached, and the mesh is fixed in place as usual. Before completely closing the peritoneum, pressure is applied from outside the body and inside the abdominal cavity to remove as much air as possible from the detached preperitoneum; the peritoneum is then sutured using a V-Loc(TM) closure device so that it does not constrict. By releasing the pressure all at once, the airtightness of the preperitoneum is maintained, and the position of the mesh can be observed through the translucent peritoneum. This method, called Mesh-Airtight-Preperitoneum (MAPP), could become widely used as a simple technique for confirming mesh position in TAPP. J. Med. Invest. 63: 270-273, August, 2016.
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http://dx.doi.org/10.2152/jmi.63.270DOI Listing
June 2017

Three-dimensional CT for preoperative detection of the left gastric artery and left gastric vein in laparoscopy-assisted distal gastrectomy.

Asian J Endosc Surg 2016 Aug 28;9(3):179-85. Epub 2016 Apr 28.

Department of Radiology, Tokushima Red Cross Hospital, Komatsushima City, Japan.

Introduction: We evaluated 3-D CT imaging for preoperative classification of the left gastric artery and vein in patients with early gastric cancer and estimated its clinical benefit.

Methods: Between April 2009 and March 2014, 279 patients underwent preoperative 3-D CT using a 64-row multi-detector CT scanner, followed by laparoscopy-assisted distal gastrectomy. The 3-D CT images of the arterial and portal phases were reconstructed and fused. The operative outcomes were compared between patients who had not undergone 3-D CT (2007-2008) and who had undergone 3-D CT (2009-2011).

Results: According to Adachi's classification, the numbers of type I, II, III, IV, V, and VI arterial patterns were 253, 15, 1, 3, 3, and 1, respectively. Three cases could not be classified. According to the Douglass classification, the left gastric vein flowed into the portal vein, splenic vein, junction of the portal vein and splenic vein, and left branch of the portal vein in 119, 111, 36, and 5 patients, respectively. The left gastric vein could not be visualized in six patients, and two patients could not be classified. In addition, the relation was absent for an Adachi type I vein and one of the "other" types of veins. The total operative time was significantly shorter with 3-D CT than without it (P = 0.01), and the degree of lymph-node dissection was significantly higher (P = 0.01). Inflammatory parameters and operative morbidity tended to decrease with 3-D CT.

Conclusion: Three-dimensional CT is a useful modality to visualize the vessel anatomy around the stomach, and it improves clinical effectiveness and reduces the invasiveness of surgery.
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http://dx.doi.org/10.1111/ases.12280DOI Listing
August 2016

Short-Term Outcomes of Laparoscopic Distal Gastrectomy for Advanced Gastric Cancer.

J Med Invest 2016 ;63(1-2):68-73

Department of Gastroenterological Surgery, Tokushima Red Cross Hospital.

The purpose of this study was to investigate the oncologic outcomes of laparoscopic distal gastrectomy (LDG) for advanced gastric cancer (AGC). Between April 2003 and March 2014, LDG was performed for 392 patients, 91 patients (23.2%) had histopathologically diagnosed AGC beyond T2 depth. The clinicopathological features, postoperative outcomes, mortality, morbidity, recurrence rate, and survivals of those patients were reviewed. The TNM stages of the tumor were IB in 26 patients (28.5%), IIA in 20 (21.9%), IIB in 18 (19.7%), IIIA in 13 (14.2%), IIIB in 6 (6.5%), IIIC in 6 (6.5%), and IV in 2 (2.1%). Major morbidity occurred in 14 patients (15.3%), with no postoperative mortality. Median follow-up was 24.5 months; 10 patients developed recurrence during the follow-up period, and 10 patients died, including 6 cancer deaths. The 5-year overall and disease-free survival rates were 76.8% and 72.6%, respectively. By stage, OS/DFS was 92.3%/91.8% in stage IB, 85.4%/85.4% in stage II, and 49.3%/26.9% in stage III. Oncologic outcomes were good in patients with AGC, especially with stage IB-IIB, who underwent LDG. LDG appears to be an effective approach for treating stage IB and II gastric cancer.
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http://dx.doi.org/10.2152/jmi.63.68DOI Listing
January 2017

[A Case of Complete Pathological Response in a Patient with Locally Advanced Sigmoid Colon Cancer after FOLFOX IRI Chemotherapy].

Gan To Kagaku Ryoho 2015 Nov;42(11):1431-4

Dept. of Gastroenterological Surgery, Tokushima Red Cross Hospital.

A 61-year-old man with advanced sigmoid colon cancer was admitted to our hospital. Abdominal computed tomography (CT) revealed locally advanced sigmoid colon cancer, with suspected invasion of the bladder and small intestine. The clinical stage of the disease was T4b, N1, M0, and Stage III a, with wild-type KRAS expression. A transverse colostomy was performed because of the presence of a bowel obstruction. The patient received 4 courses of Leucovorin, 5-fluorouracil, oxaliplatin, and irinotecan (FOLFOXIRI). The size of the tumor and lymph nodes decreased noticeably after chemotherapy and laparoscopic high anterior resection with lymph node dissection. During this phase, the pathological stage of the disease was ypT0, N0, and Stage 0(no viable carcinoma cells, Grade 3). This result suggested that preoperative FOLFOXIRI chemotherapy is a useful regimen for the treatment of locally advanced colon cancer.
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November 2015

[A case of gastric cancer in which grade 2 treatment effects were obtained with preoperative two-week S-1 administration].

Gan To Kagaku Ryoho 2015 May;42(5):637-40

Dept. of Digestive Surgery, Tokushima Red Cross Hospital.

In our hospital, a clinical trial on the effects of preoperative 2-week S-1 administration for advanced gastric cancer is being conducted. A7 5-year-old man presented to our hospital with a type 2 tumor(poorly differentiated adenocarcinoma)in the pyloric antrum. Subpyloric lymph node enlargement and a c-T2(MP), N1, M0, Stage II A tumor (according to the gastric cancer handling agreement, 14th edition)were diagnosed, and S-1(100mg/day)was subsequently administered for 14 days. On day 15, we performed laparoscopy-assisted distal gastrectomy, with D2 dissection. Analysis of the resected specimen, ie the primary tumor and metastatic lymph nodes, confirmed the effect of the treatment as Grade 2, and revealed a type 2 gastric cancer of 30×20mm in size; this tumor was downstaged to yp-T1b(SM), N1, Stage I B. No adverse events associated with perioperative S-1 were observed, and the postoperative course was good. At the latest follow-up(6 years after treatment), no recurrence was observed.
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May 2015