211,117 results match your criteria tomography scan


Costal Osteoma: Report of a Case in an Unusual Site.

Am J Case Rep 2021 Apr 17;22:e930902. Epub 2021 Apr 17.

Department of Pathology, Inje University Haeundae Paik Hospital, Inje University College of Medicine, Busan, South Korea.

BACKGROUND Osteoma is a benign bone tumor that typically arises in facial bones and less frequently in the long bones. It rarely occurs in the appendiceal skeleton. Pathologic findings are similar to those for parosteal osteosarcoma, periostitis ossificans, and osteoid osteoma. Read More

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Preoperative 2-[F]FDG PET-CT aids in the prognostic stratification for patients with primary ampullary carcinoma.

Eur Radiol 2021 Apr 17. Epub 2021 Apr 17.

Department of Nuclear Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, No.7, Chung-Shan South Road, Chung-Cheng District, Taipei, 100, Taiwan, Republic of China.

Objectives: We sought to investigate whether preoperative dual-phase 2-[F]FDG PET-CT identify predictors for poor survival in patients with ampullary carcinoma receiving pancreaticoduodenectomy.

Methods: The preoperative PET-CT images of patients with resected ampullary carcinoma from June 2007 to July 2017 were analyzed. Survival curves were analyzed using the Kaplan-Meier method and compared with the log-rank test. Read More

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Prosthetically-Driven Full-Mouth Implant-Supported Prostheses Using Guided Surgical Implant Planning With Composite Resin Markers: A Case Report.

J Prosthodont 2021 Apr 17. Epub 2021 Apr 17.

Department of Implant Surgery, Faculty of Health Sciences, Alfonso X El Sabio University, Madrid, Spain.

This report describes a prosthetically-driven implant planning method, guided by the alignment procedures between the cone beam computed tomography, intraoral digital scans, and digitized maxillary and mandibular interim complete dentures using intraoral composite resin markers as a common reference. The markers were attached to the keratinized oral mucosa of the edentulous ridges using cyanoacrylate and kept in place during the digitizing procedures. The technique provides a simpler and more economical alternative to conventional prosthetically-driven static implant planning methods. Read More

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A computed tomography cadaveric study of the radiological anatomy of the patella: the size of the patella correlates with bone bridge between tunnels and R angles are introduced for safe tunnel drilling during MPFL reconstruction.

J Exp Orthop 2021 Apr 17;8(1):29. Epub 2021 Apr 17.

Department of Anatomy, University Hospital of Larissa, Larissa, Greece.

Purpose: To measure the safe range of angles during tunnel drilling and map ideal patella tunnel placement with the use of preoperative computed tomography (CT) scan and compare results after medial patellofemoral ligament (MPFL) reconstruction using a hardware-free patellar fixation technique with two semi-patellar tunnels between a) a free-hand technique, and b) its modification with the use of an anterior cruciate ligament (ACL) tibia aiming device.

Methods: CT scan was performed on 30 fresh-frozen cadaveric knees a) prior to any intervention and b) after MPFL reconstruction. For MPFL reconstruction, specimens were randomly allocated to 1) Group A, which consisted of knees operated with free-hand, hardware-free patellar fixation technique with two semi-patellar tunnels and 2) Group B, which consisted of knees operated on with a technique modification with the ACL tibia device. Read More

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LoDoPaB-CT, a benchmark dataset for low-dose computed tomography reconstruction.

Sci Data 2021 Apr 16;8(1):109. Epub 2021 Apr 16.

Center for Industrial Mathematics, University of Bremen, Bibliothekstr. 5, 28359, Bremen, Germany.

Deep learning approaches for tomographic image reconstruction have become very effective and have been demonstrated to be competitive in the field. Comparing these approaches is a challenging task as they rely to a great extent on the data and setup used for training. With the Low-Dose Parallel Beam (LoDoPaB)-CT dataset, we provide a comprehensive, open-access database of computed tomography images and simulated low photon count measurements. Read More

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Primary angiosarcoma of superior vena cava: an unexpected diagnosis after an oncological emergency.

BMJ Case Rep 2021 Apr 16;14(4). Epub 2021 Apr 16.

Internal Medicine, Centro Hospitalar Universitário de Coimbra EPE, Coimbra, Portugal.

Angiosarcoma (AS) is a rare malignant tumour representing 1%-2% of all sarcomas. Primary AS of superior vena cava (SVC) was reported in two cases worldwide. We report a 69-year-old woman with neck discomfort, headache and dyspnoea for 3 months. Read More

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Use of Three-dimensional Titanium Trusses for Arthrodesis Procedures in Foot and Ankle Surgery: A Retrospective Case Series.

J Foot Ankle Surg 2020 Aug 15. Epub 2020 Aug 15.

Program Director, Foot & Ankle Residency Training Program, West Penn Hospital, Allegheny Health Network, Pittsburgh, PA. Electronic address:

Periarticular osseous defects pose a challenge when considering arthrodesis. Failure to restore the cubic content of bone can result in shortening and malalignment, as well as subsequent biomechanical issues. This study reports on 12 patients treated with patient-specific 3-D printed (7) and prefabricated titanium trusses (5). Read More

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Abdominal aortic aneurysm and acute appendicitis: a case report and review of the literature.

J Med Case Rep 2021 Apr 17;15(1):203. Epub 2021 Apr 17.

Servicio de Angiología y Cirugía Vascular, Complejo Asistencial Universitario de Salamanca (CAUSA), Instituto de Investigación Biomédica de Salamanca (IBSAL), Universidad de Salamanca (USAL), Paseo de San Vicente 139, 37007, Salamanca, Spain.

Background: Abdominal aortic aneurysm and acute appendicitis occur relatively frequently in elderly patients. However, the co-occurrence of the two pathologies is very rare and serious.

Case Presentation: We present the case of an elderly Caucasian patient who was aware of having an abdominal aortic aneurysm but refused treatment and was subsequently admitted to the hospital's emergency department with acute abdominal symptoms. Read More

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Associations of D-dimer with CT Lung Abnormalities, Serum Biomarkers of Lung Injury, and Forced Vital Capacity: MESA Lung Study.

Ann Am Thorac Soc 2021 Apr 16. Epub 2021 Apr 16.

Weill Cornell Medical College, 12295, Department of Medicine, New York, New York, United States.

Rationale: The coagulation cascade may play a role in the pathogenesis of interstitial lung disease through increased production of thrombin and fibrin deposition. Whether circulating coagulation cascade factors are linked to lung inflammation and scarring among community-dwelling adults is unknown.

Objective: To test the hypothesis that higher baseline D-dimer levels are associated with markers of early lung injury and scarring. Read More

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Association of disorganization of retinal inner layers with optical coherence tomography angiography features in branch retinal vein occlusion.

Graefes Arch Clin Exp Ophthalmol 2021 Apr 16. Epub 2021 Apr 16.

Department of Ophthalmology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, E-7, Suita, Osaka, 565-0871, Japan.

Purpose: To examine the associations between the disorganization of the retinal inner layers (DRIL) and optical coherence tomography angiography characteristics and visual acuity (VA) outcomes in eyes with macular edema secondary to branch retinal vein occlusion (BRVO).

Methods: In this single-center cross-sectional cohort study, the data of 43 patients with macular edema secondary to BRVO that received pro re nata anti-vascular endothelial growth factor therapy were analyzed. B-scan and en face angiographic images were obtained by swept-source-based wide-field optical coherence tomography angiography performed at a single visit 1 month after the anti-vascular endothelial growth factor therapy session and evaluated. Read More

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Densitometry marks delineating the affected area in keratoconus: clinical suitability of a new descriptive system based on its repeatability and reproducibility.

Ophthalmic Physiol Opt 2021 Apr 16. Epub 2021 Apr 16.

Department of Ophthalmology, Antwerp University Hospital (UZA), Edegem, Belgium.

Purpose: To present a descriptive system for the elliptic demarcation area seen in keratoconus densitometry maps (obtained with a Scheimpflug tomographer) and to evaluate its suitability for clinical practice.

Methods: The subjects were 30 keratoconus patients at different stages and 20 healthy subjects. The averaged densitometry maps ('two-layers' scan, with fixed layers 120 µm and endothelium) were analysed using a system of four categories (termed 'Brightness', 'Contrast', 'Decentration' and 'Octants surrounded by a dark line') that we created to characterise the demarcation area. Read More

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Validation of a simple technique of volumetric analysis of complex incisional hernias without 3D CT scan reconstruction.

Surg Endosc 2021 Apr 15. Epub 2021 Apr 15.

Department of Surgery, University of Massachusetts Medical School-Baystate, Springfield, MA, USA.

Purpose: Volumetric analysis is being increasingly utilized in the preoperative evaluation of complex incisional hernias. Three-dimensional (3D) reconstruction of abdominal computed tomography (CT) scan has been used to obtain surface area (SA) and volume (Vol.) measurements, while others have used simple mathematical formulas to obtain SA and Vol. Read More

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Sustained Release GLP-1 Agonist PT320 Delays Disease Progression in a Mouse Model of Parkinson's Disease.

ACS Pharmacol Transl Sci 2021 Apr 16;4(2):858-869. Epub 2021 Mar 16.

Department of Neurological Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei 11490, Taiwan.

GLP-1 agonists have become increasingly interesting as a new Parkinson's disease (PD) clinical treatment strategy. Additional preclinical studies are important to validate this approach and define the disease stage when they are most effective. We hence characterized the efficacy of PT320, a sustained release formulation of the long acting GLP-1 agonist, exenatide, in a progressive PD (MitoPark) mouse model. Read More

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Bisegmentectomy and venous reconstruction after portal vein embolization for the remnant hemiliver in a patient with recurrent colorectal liver metastases.

Ann Gastroenterol Surg 2021 Mar 29;5(2):259-264. Epub 2020 Aug 29.

Department of Hepato-Biliary-Pancreatic Surgery Kyorin University Hospital Mitaka Japan.

Repeat hepatectomy for recurrent colorectal liver metastases (CRLM) for the remnant hemiliver is sometimes challenging due to the insufficient future liver remnant (FLR) volume. We present an aggressive strategy for resection of the recurrent CRLM involving bisegmentectomy of the remnant right hemiliver with the aid of portal vein embolization (PVE) and venous reconstruction. The patient was a 50-year-old woman who had undergone left hemihepatectomy for a CRLM 10 months ago. Read More

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Clinical and Molecular Differentiation Between Malignant Rhabdoid Tumor of the Kidney and Normal Tissue: A Two-Case Report.

Front Oncol 2021 30;11:659709. Epub 2021 Mar 30.

Department of Urology, Kunming Children's Hospital, Kunming, China.

Background: Malignant rhabdoid tumor of the kidney (MRTK) is a rare type of tumor that lacks typical clinical manifestations. Herein, we presented clinical data of 2 children with MRTK. In addition, we used a high-throughput RNA-sequencing (RNA-seq), GO analysis, and KEGG signaling pathway analysis to examine gene expression differences at the transcripts level between 2 patients with MRTK and 3 patients with non-tumor diseases without other symptoms. Read More

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PSMA Expression in Glioblastoma as a Basis for Theranostic Approaches: A Retrospective, Correlational Panel Study Including Immunohistochemistry, Clinical Parameters and PET Imaging.

Front Oncol 2021 30;11:646387. Epub 2021 Mar 30.

Department of Neurosurgery, University Hospital, LMU Munich, Munich, Germany.

Aim: The aim of the current study was to enlighten the evolution of prostate-specific membrane antigen (PSMA) expression in glioblastoma between initial diagnosis and recurrence in order to provide preliminary insight for further clinical investigations into innovative PSMA-directed treatment concepts in neuro-oncology.

Methods: Patients who underwent resection for de-novo glioblastoma (GBM) and had a re-resection in case of a recurrent tumor following radiochemotherapy and subsequent chemotherapy were included (n = 16). Histological and immunohistochemical stainings were performed at initial diagnosis and at recurrence (n = 96 tissue specimens). Read More

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Solitary Renal Metastasis Arising from a Pulmonary Adenoid Cystic Carcinoma: A Case Report and Review of the Literature.

Case Rep Urol 2021 30;2021:8863475. Epub 2021 Mar 30.

Histopathology and Cytology Laboratory Services, Nicosia, Cyprus.

Adenoid cystic carcinoma (ACC) is a malignancy affecting the salivary glands and rarely involving the lung. Due to its rarity, primary lung ACC remains incompletely understood. We herein report the case of a 57-year-old female patient who was initially diagnosed with primary lung ACC and was treated by lobectomy. Read More

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Foreign Body Ingestion Followed by Appendiceal Perforation.

Case Rep Surg 2021 29;2021:8877671. Epub 2021 Mar 29.

Kuwait University, Kuwait.

Background: Foreign body ingestion is very common among specific groups, especially children. However, appendicitis and perforated appendix caused by a foreign body is rare. . Read More

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Clinical Presentation and Management Strategies in Intraorbital Foreign Bodies.

Case Rep Ophthalmol Med 2021 30;2021:6645952. Epub 2021 Mar 30.

Guru Nanak Eye Centre, Maulana Azad Medical College, New Delhi, India.

The authors present a retrospective, observational case study of seven patients, who presented with retained Intra-Orbital Foreign Bodies (IOrbFBs) following penetrating orbital injury at a tertiary eye hospital over a period of one year. Cases were reviewed for epidemiological features, mechanism of injury, nature of foreign body, clinical features, imaging modality, associated complications, management outcomes, and the final prognosis. The mean age of presentation was 27. Read More

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Hepatic encephalopathy induced by Lenvatinib and anti-PD-1 mAb in a patient with advanced hepatocellular carcinoma: A case report.

Mol Clin Oncol 2021 Jun 1;14(6):110. Epub 2021 Apr 1.

Department of Gastroenterology Oncology, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, Shandong 250117, P.R. China.

Previous studies have reported that the combinational therapy of Lenvatinib and anti-programmed cell death-1 (PD-1) monoclonal antibody (mAb) produced a longer overall survival in patients with hepatocellular carcinoma (HCC). The current case report presented a a patient with HCC who had hepatic encephalopathy (HE) following treatment with Lenvatinib and anti-PD-1 mAb. The 42-year-old patient was diagnosed with stage IVa HCC accompanied with cirrhosis and Child-Pugh C. Read More

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Metachronous multiple pulmonary nodules 9 years after esophagectomy: a case report.

J Surg Case Rep 2021 Apr 9;2021(4):rjab096. Epub 2021 Apr 9.

Department of Thoracic Surgery, Bell-Land General Hospital, Sakai, Japan.

A 79-year-old man was referred to our hospital for further examination. He had undergone radical esophagectomy with right thoracotomy 9 years ago. Four cycles of chemotherapy (CDDP +5-FU) were also performed for him. Read More

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GraphCovidNet: A graph neural network based model for detecting COVID-19 from CT scans and X-rays of chest.

Sci Rep 2021 Apr 15;11(1):8304. Epub 2021 Apr 15.

Department of Computer Science and Engineering, Jadavpur University, Kolkata, 700032, India.

COVID-19, a viral infection originated from Wuhan, China has spread across the world and it has currently affected over 115 million people. Although vaccination process has already started, reaching sufficient availability will take time. Considering the impact of this widespread disease, many research attempts have been made by the computer scientists to screen the COVID-19 from Chest X-Rays (CXRs) or Computed Tomography (CT) scans. Read More

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Brown Adipose Tissue Volume and Fat Content are Positively Associated with Whole-Body Adiposity in Young Men, Not in Women.

Diabetes 2021 Apr 15. Epub 2021 Apr 15.

PROFITH "PROmoting FITness and Health through Physical Activity" Research Group, Sport and Health University Research Institute (iMUDS), Department of Physical Education and Sports, Faculty of Sport Sciences, University of Granada, Crta. Alfacar s/n, 18071 Granada, Spain.

Human brown adipose tissue (BAT) volume has been consistently claimed as inversely associated with whole-body adiposity. However, recent advances in the assessment of human BAT suggest that previously reported associations may have been biased. The present cross-sectional study investigates the association of BAT volume, mean radiodensity, and F-fluordeoxyglucose (F-FDG) uptake (assessed via a static positron emission tomography-computerized tomography (PET-CT) scan after a 2-hour personalized cold exposure) with whole-body adiposity (measured by dual-energy X-ray absorptiometry) in 126 young adults (42 men/84 women; 25±5 kg/m). Read More

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Association between Topographic Features of the Retinal Nerve Fiber Bundle and Good Visual Acuity in Patients with Glaucoma.

Curr Eye Res 2021 Apr 16:1-8. Epub 2021 Apr 16.

Department of Ophthalmology, Tohoku University Graduate School of Medicine, Sendai, Japan.

: Maintaining visual acuity in glaucoma patients is an important part of preventing the deterioration of quality of vision. We identified specific areas of the papillomacular bundle (PMB) that were strongly associated with visual acuity, based on en-face images derived from optical coherence topography (OCT) wide scans.: The study recruited 23 eyes of 21 glaucoma patients (age: 61. Read More

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Metastatic Mixed Adeno-Neuroendocrine Carcinoma of the Colon to the Liver with Multiple Peritoneal Deposits: A Case Report.

Am J Case Rep 2021 Apr 15;22:e929099. Epub 2021 Apr 15.

Department of General Surgery, Colorectal Surgery Section, King Fahad Specialist Hospital, Dammam, Saudi Arabia.

BACKGROUND Metastatic mixed adeno-neuroendocrine carcinoma (MANEC) is a rare malignancy. It is characterized by the presence of both neuroendocrine and epithelial components, each of which constitute at least 30% of the lesion to establish the diagnosis. CASE REPORT A 48-year-old man presented with a 1-month history of right upper-quadrant pain and unintentional weight loss of 18 kg. Read More

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Cine Cardiac MRI Motion Artifact Reduction Using a Recurrent Neural Network.

IEEE Trans Med Imaging 2021 Apr 15;PP. Epub 2021 Apr 15.

Cine cardiac magnetic resonance imaging (MRI) is widely used for the diagnosis of cardiac diseases thanks to its ability to present cardiovascular features in excellent contrast. As compared to computed tomography (CT), MRI, however, requires a long scan time, which inevitably induces motion artifacts and causes patients' discomfort. Thus, there has been a strong clinical motivation to develop techniques to reduce both the scan time and motion artifacts. Read More

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Consensus for Treatment of Metastatic Castration-Sensitive Prostate Cancer: Report From the First Global Prostate Cancer Consensus Conference for Developing Countries (PCCCDC).

JCO Glob Oncol 2021 Apr;7:550-558

Oncology Institute of Southern Switzerland (IOSI), Bellinzona and Università della Svizzera Italiana, Lugano, Switzerland.

Purpose: International guideline recommendations may not always be extrapolated to developing countries where access to resources is limited. In metastatic castration-sensitive prostate cancer (mCSPC), there have been successful drug and imaging advancements that were addressed in the Prostate Cancer Consensus Conference for Developing Countries for best-practice and limited-resource scenarios.

Methods: A total of 24 out of 300 questions addressed staging, treatment, and follow-up for patients with mCSPC both in best-practice settings and resource-limited settings. Read More

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Consensus on the Treatment and Follow-Up for the Nonmetastatic Castration-Resistant Prostate Cancer: A Report From the First Prostate Cancer Consensus Conference for Developing Countries.

JCO Glob Oncol 2021 Apr;7:545-549

Latin American Cooperative Oncology Group-Genitourinary, Porto Alegre, Brazil.

Purpose: To present a summary of the recommendations for the treatment and follow-up for the biochemical recurrence of castration-resistant prostate cancer (PCa) as acquired through a questionnaire administered at the Prostate Cancer Consensus Conference for Developing Countries.

Methods: A total of 27 questions were identified as relating to this topic. Responses from the clinician were tallied and are presented in percentage format. Read More

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The influence of digital PET/CT on diagnostic certainty and interrater reliability in [Ga]Ga-PSMA-11 PET/CT for recurrent prostate cancer.

Eur Radiol 2021 Apr 15. Epub 2021 Apr 15.

Department of Nuclear Medicine, Inselspital, Bern University Hospital, University of Bern, Freiburgstr. 18, 3010, Bern, Switzerland.

Objective: To investigate the impact of digital PET/CT on diagnostic certainty, patient-based sensitivity and interrater reliability.

Methods: Four physicians retrospectively evaluated two matched cohorts of patients undergoing [Ga]Ga-PSMA-11 PET/CT on a digital (dPET/CT n = 65) or an analogue scanner (aPET/CT n = 65) for recurrent prostate cancer between 11/2018 and 03/2019. The number of equivocal and pathological lesions as well as the frequency of discrepant findings and the interrater reliability for the two scanners were compared. Read More

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Diagnostic performance and radiation dose of reduced vs. standard scan range abdominopelvic CT for evaluation of appendicitis.

Eur Radiol 2021 Apr 15. Epub 2021 Apr 15.

Department of Diagnostic Radiology, Queen Elizabeth II Health Sciences Centre, Nova Scotia Health and Dalhousie University, 1276 South Park Street, Halifax, Nova Scotia, B3H 2Y9, Canada.

Objective: To compare the diagnostic performance and radiation dose of reduced vs. standard scan range CT in diagnosing appendicitis.

Methods: We retrospectively evaluated 531 consecutive adults who underwent emergency contrast-enhanced CT for abdominal pain or suspected appendicitis between July 2018 and March 2019. Read More

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