Publications by authors named "Hampar Akkaya"

16 Publications

  • Page 1 of 1

Proliferating Trichilemmal Tumor of the Auricula: A Very Rare Locus.

Indian J Otolaryngol Head Neck Surg 2019 Nov 3;71(Suppl 2):1436-1438. Epub 2018 Nov 3.

1Otorhinolaryngology Department, Medical Faculty, Başkent University, Ankara, Turkey.

Proliferating trichilemmal tumor (PTT) is a rare but morphologically characteristic tumor, derived from the external root sheath. They are commonly localized as a solitary lesion on the scalp. They rarely occur in other regions. PTTs generally behave in a benign fashion, up to 20% of the lesions may undergo malignant transformation into squamous carcinoma. We present an elderly woman with a cystic swelling on the crus of auricular helix diagnosed as PTT. To our knowledge, this is the first case in the English literature, of PTT of the auricula.
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http://dx.doi.org/10.1007/s12070-018-1522-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6841841PMC
November 2019

Squamous cell carcinoma of the penis: a clinicopathological study from a population with late circumcision.

Rom J Morphol Embryol 2019 ;60(2):521-529

Department of Pathology, School of Medicine, Hacettepe University, Ankara, Turkey;

Squamous cell carcinoma (SCC) of the penis has been subject to only a few studies in populations where late childhood circumcision is performed. To asses clinicopathological features and human papillomavirus (HPV) status of penile SCC in men with late circumcision, eight institutions in the country volunteered to collaborate and 15 cases of penile SCC were collected from their pathology archives. The presence and genotype of HPV were determined in addition to clinicopathological features of the tumors. Findings were correlated with disease outcome. The mean age of the patients evaluated was 66.5 years. Histological subtypes were usual SCC (6∕15), papillary (2∕15), mixed (2∕15), basaloid (2∕15), acantholytic (1∕15), pseudohyperplastic (1∕15), and warty-basaloid (1∕15) carcinomas. HPV was identified in 33.3% of samples; HPV16 was detected in 60% of positive cases and was associated with basaloid and/or warty morphology. Cause-specific 1-year and 2-year survivals were 76.9% and 54.5%, respectively. The usual subtype and nodal metastasis were associated with worse outcome (p=0.045 and p=0.047, respectively). As a conclusion, our results suggest an inclination for penile SCC to develop at a later age in a population with late circumcision than the patients from the regions of high penile cancer incidence. These men seem to have less frequent HPV association and their outcome appears poorer than other populations, although reaching substantial provision is not possible due to our limited case number.
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April 2020

Shrinkage of Nasal Mucosa and Cartilage During Formalin Fixation.

Balkan Med J 2017 Sep 29;34(5):458-463. Epub 2017 May 29.

Departments of Biochemistry, Başkent University School of Medicine, Ankara, Turkey.

Background: After resection, specimens are subjected to formalin fixation during histological processing. This procedure can result in tissue shrinkage, with the amount of shrinkage related to tissue composition and tissue type.

Aims: To evaluate the shrinkage of nasal mucosa and cartilage tissue and compare differences in shrinkage after resection, after formalin fixation, and during microscopic examination to understand differences in the rate of shrinkage of different tissue types.

Study Design: Animal experimentation.

Methods: Fresh nasal septa were excised from sheep (10 mm diameter in 40 sheep and 20 mm diameter in 40 sheep). The mucosa was separated from one side of the cartilage, with the contralateral mucosa remaining attached to the cartilage. Specimen diameters were measured in situ, after resection, after fixation for 6 or 24 hours (10% formalin), and during microscopic examination.

Results: There were no differences between the in situ and after resection diameters of any tissue components (free mucosa, mucosa attached to cartilage, and cartilage) of all nasal specimens (10- or 20-mm diameter and 6- or 24-hour fixation). However, significant shrinkage occurred between resection and after-fixation. Regarding tissue specimens that were fixed for different durations (6 or 24 hours), we observed a significantly smaller mean tissue diameter in specimens fixed for 24 hours versus those fixed for 6 hours for mucosa attached to cartilage (in the 10-mm diameter after-fixation samples), free mucosa (in the 20-mm diameter after-fixation samples), mucosa attached to cartilage (in the 20-mm diameter after-fixation and microscopic measurement samples), and cartilage (in the 20-mm diameter after-fixation samples). Tissue shrinkage was greatest in free mucosal tissue and least in cartilage.

Conclusion: These results should be considered when evaluating patients undergoing surgical procedures for nasal cavity and paranasal sinus malignancies. Surgical margins should be measured before fixation or evaluated if possible before fixation and shrinkage.
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http://dx.doi.org/10.4274/balkanmedj.2015.1470DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5635634PMC
September 2017

C-MYC and BCL2 translocation frequency in diffuse large B-cell lymphomas: A study of 97 patients.

Indian J Pathol Microbiol 2016 Jan-Mar;59(1):41-6

Department of Pathology, Akdeniz University, Antalya, Turkey.

Purpose: Diffuse large B-cell lymphoma (DLBCL) is an aggressive non-Hodgkin lymphoma with marked biologic heterogeneity. MYC and BCL2 rearrangements have been reported in a proportion of DLBCLs, where they may be associated with an adverse clinical outcome. The aim of this study was to determine the frequency of MYC and BCL2 translocations in DLBCL and assess the prognostic impact in DLBCL patients.

Materials And Methods: In the present study, we evaluated the expression patterns of CD 10, BCL6, and MUM 1 by immunohistochemistry in 121 cases with DLBCL in tissue microarray (TMA): 62 cases in germinal center B-cells (GCBs); and 59 cases in activated B-cells (ABCs) of which 60 were females and 61 were males. MYC and BCL2 rearrangements were investigated by interphase fluorescence in situ hybridization on TMAs in 97 DLBCLs.

Result: MYC rearrangements were observed in 11 of 97 cases. There was no association with other clinical features, including age, sex, and nodal/extranodal disease. MYC rearrangement was associated with significantly worse overall survival (P < 0.01). BCL2 rearrangements were observed in 14 of 97 cases. There was no association with other clinical features including age and sex. BCL2 rearrangement had a worse outcome (P < 0.01). MYC and BCL2 rearrangements were observed in 3 of 97 cases with the age of  53 (female), 53, 63 years old, respectively, died in 24, 18, and 35 months after the diagnosis. Two cases had primary nodal and one case primary extranodal presentations. All these patients had stage IV disease.

Conclusion: We concluded that C-MYC and BCL2 may contribute to aggressive transformation, and more mechanism-based therapy should be explored. Targeted therapies involving these rearrangements and its associated pathways may change the fate of DLBCLs. Analysis of MYC gene rearrangement along with BCL2 is critical in the identification of high-risk patients with poor prognosis.
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http://dx.doi.org/10.4103/0377-4929.178220DOI Listing
January 2017

Metachronous Occurrence of Granular Cell Tumor in Breast Skin and Scalp: Diagnostic Challenging Differentiating Benign from Malignant and a Literature Review.

Case Rep Pathol 2016 3;2016:8043183. Epub 2016 Jan 3.

Department of Dermatology, Başkent University School of Medicine, 06490 Ankara, Turkey.

Granular cell tumor (GCT) is a Schwann cell related benign neoplasm of soft tissue. GCT is an uncommon entity that occurs in a wide variety of body sites, but it is generally presented in the skin, oral cavity, superficial soft tissue, and respiratory and digestive tracts. Most of the GCTs are benign but clinically and radiologically these may mimic malignancy. Histopathological diagnosis is gold standard for establishing the true nature of the lesion. GCT is most commonly solitary but in about 10% of cases can be multifocal, usually involving various skin and soft tissue sites versus involving various internal sites. Therefore, these can involve skin and soft tissue or submucosa and viscera. GCT is usually benign; however, local recurrence is common due to incomplete removal. Malignant cases are rarely reported in 1-2% of cases. In this study, we report clinical and histopathological findings of a 36-year-old woman with metachronous GCT in breast and scalp. The clinical features raise the question of whether these are metachronous benign GCTs or whether this is establishment of malignant behavior. The aim of this report is to present the histopathological and clinical features of GCT and the diagnostic challenge of differentiating benign from malignant GCT.
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http://dx.doi.org/10.1155/2016/8043183DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4735923PMC
February 2016

Hydatid disease involving some rare sites in the body.

Turkiye Parazitol Derg 2015 Mar;39(1):78-82

Department of Pathology, Başkent University Faculty of Medicine, Antalya, Turkey.

A hydatid cyst is an endemic disease in our country. Clinical manifestation includes cyst formation, most commonly in the liver and lungs. Renal, brain, and subcuteneous localizations are rare. Here we report four cases: two cases of primary renal hydatid disease, one of intracranial hydatid cyst, and one of subcutaneous hydatid cyst. We discuss the prevalence, diagnostic workup, and management of echinococcosis.
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http://dx.doi.org/10.5152/tpd.2015.3669DOI Listing
March 2015

Hyperpigmentation of tongue associated with hepatitis C treatment.

Balkan Med J 2013 Jun;30(2):257-8

Deparment of Pathology, Başkent University Faculty of Medicine, Antalya, Turkey.

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http://dx.doi.org/10.5152/balkanmedj.2013.8159DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4115967PMC
June 2013

Phyllodes tumor of the vulva: report of two cases.

Turk Patoloji Derg 2013 ;29(1):73-6

Department of Pathology, Akdeniz University, Faculty of Medicine, Antalya, Turkey.

Ectopic breast tissue can occur anywhere along the primitive embryonic milk line and can be the site of the same pathologic processes found in the normal breast. Phyllodes tumor is an extremely rare fibroepithelial neoplasm that occurs in ectopic breast tissue of the vulva. To date, only 8 cases of phyllodes tumor in the vulva have been reported in the literature. This paper presents two additional case of benign phyllodes tumor in the vulva. The first patient was a 43-year-old woman, presenting with a lesion on the left anterior mons pubis that had increased in size in the last three months. The second patient was a 50-year-old woman, presenting with a two-month history of a mass in the right labium majus. The patients underwent excisional biopsy. The histological examination of both specimens revealed a characteristic pattern of benign phyllodes tumor. In conclusion, the pathologists need to be aware that the lesion can occur in this location. Herein, the concepts about the histogenesis of phyllodes tumor in the vulva are discussed and a brief review of the previously reported cases is given.
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http://dx.doi.org/10.5146/tjpath.2013.01153DOI Listing
February 2014

Massive idiopathic scrotal calcinosis.

Urology 2012 Dec 27;80(6):e71-2. Epub 2012 Sep 27.

Department of Urology, Alanya Practice and Research Center, Başkent University Faculty of Medicine, Alanya, Turkey.

Idiopathic scrotal calcinosis is a rare, benign condition with the presence of multiple slow-growing yellowish-white calcified asymptomatic nodules that appear within the scrotal skin. The disease affects patients in childhood or early adulthood. The etiology of idiopathic scrotal calcinosis is still controversial. It can extensively affect the scrotal skin, but primary closure is usually achievable with good esthetic outcomes.
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http://dx.doi.org/10.1016/j.urology.2012.08.030DOI Listing
December 2012

Primary leiomyosarcoma of the breast: a case report.

J Breast Cancer 2012 Mar 28;15(1):124-7. Epub 2012 Mar 28.

Department of Surgery, Baskent University Medical Faculty, Ankara, Turkey.

Primary leiomyosarcoma of the breast is an extremely rare tumor, accounting for less than 1% of all breast tumors and only 24 cases have been reported in the English medical journals. It is quite difficult to diagnose leiomyosarcoma preoperatively. Establishing an accurate diagnosis is very important in planning treatment. When preoperative diagnosis can be achieved before or during the operation, wide resection should be performed. There is no need for axillary lymph node dissection. In this case report, we present a case involving primary leiomysarcoma of the breast in a 48-year-old woman and we discuss optimal treatment options.
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http://dx.doi.org/10.4048/jbc.2012.15.1.124DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3318164PMC
March 2012

Congenital cavernous hemangioma of the skull.

Turk Neurosurg 2011 ;21(4):645-7

Baskent University, Faculty of Medicine, Department of Neurosurgery, Alanya/Antalya, Turkey.

Calvarial cavernous hemangiomas (CHs) comprise 0.2% of benign neoplasms of the skull and frequently occur in the second and fourth decades. Their occurrence in infancy is extremely rare and they can initially be misdiagnosed as cephal hematoma or caput succadeneum that can occur due to the birth trauma, but trauma is not a predisposing factor. CT scan is more helpful than other neuro-imaging studies and untreated CHs of the skull may show progression. Only two cases of congenital primary CH of the skull without intracranial invasion have been reported in the literature. Herewith we reported a 4-month-old infant operated on due to a CH of the parietal bone and discussed the diagnostic and therapeutic modalities.
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http://dx.doi.org/10.5137/1019-5149.JTN .2950-10.1DOI Listing
April 2012

Ileovesical fistula secondary to chemotherapy for follicular non-Hodgkin lymphoma: a case report and review of the literature.

Turk J Gastroenterol 2011 ;22(2):205-7

Department of Surgery, Baskent University, School of Medicine, Alanya, Antalya, Turkey.

Enterovesical fistulas are rare complications of malignancies, diverticulitis, inflammatory bowel diseases, radiotherapy, and traumas involving the colorectal and pelvic region. In this study, an ileovesical fistula that occurred during chemotherapy for non-Hodgkin lymphoma is presented. The patient had acute abdomen and multiple comorbidities, and ileovesical fistula was diagnosed during the operation. The affected intestinal segment was resected, and an end-to-end anastomosis was performed with a primary bladder repair. This is a reliable treatment method for such cases.
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http://dx.doi.org/10.4318/tjg.2011.0194DOI Listing
December 2011

Rapidly progressing malignant insulinoma presented with multiple liver metastases: a case report.

J Gastrointest Cancer 2010 Dec;41(4):272-4

Departments of Gastroenterology, Baskent University, Ankara, Turkey.

Introduction: A 51-year-old female was admitted to emergency unit with sudden loss of consciousness. Her blood glucose level from fingertip was 33 mg/dl, and insulin level was 55 (normal range, 4-17 IU). Abdominal ultrasonography revealed pancreatic mass with diffuse liver metastases. Biopsy of liver metastases showed differentiated neuroendocrine carcinoma.

Methods And Results: Diazoxide and chemotherapy stabilized her glucose level for more than 4 months. However, the disease showed progression, and death occurred 8 months later.

Conclusion: In conclusion, this case may suggest that biologic behavior may differ from histological behavior in insulinoma and platin-based systemic chemotherapy may provide some benefit in patients those who had diazoxide- and octreotide-resistant tumors.
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http://dx.doi.org/10.1007/s12029-010-9157-9DOI Listing
December 2010

Congenital teratoma of the tongue: a case report and review of the literature.

J Pediatr Surg 2006 Nov;41(11):e25-8

Department of Pediatric Surgery, Baskent University Faculty of Medicine, 06490 Bahçelievler Ankara, Turkey.

Teratomas of the head and neck are rare. They develop in neonates and are associated with feeding difficulty, airway obstruction, and difficulty in swallowing (which may cause polyhydramnios). Although some tumors consist of immature elements, teratomas of the head and neck are mature in nature, and excision is the most effective treatment. We present a case report of a neonate with a polypoid mass protruding from his mouth. He exhibited respiratory arrest immediately after birth and underwent intubation. The mass, which was completely excised, was histologically identified as a mature teratoma.
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http://dx.doi.org/10.1016/j.jpedsurg.2006.08.039DOI Listing
November 2006

Unaware of a giant serous cyst adenoma: a case report.

Arch Gynecol Obstet 2006 Mar 25;273(6):381-3. Epub 2005 Oct 25.

Alanya Hospital, Department of Obstetrics and Gynecology, Başkent University, Alanya, Antalya, Turkey.

A case of 36-year-old nonmarried virgin woman presenting a giant ovarian serous cyst adenoma weighing 9.5 kg is reported here. Ovarian neoplasms may be divided by origin cell type into three main groups: epithelial, stromal and germ cell. Taken as a group, the epithelial tumors are by far the most common type. The single most common benign ovarian neoplasm is the benign cystic teratoma; however, according to some studies it is serous cyst adenoma. A 36-year-old nonmarried virgin woman was referred to our clinic from a local medical center. When she was seen first at our outpatient clinic, she looked like a 9-month pregnant woman. Her medical history was normal. She had no serious illness or operation before. On abdominal ultrasound, a giant cyst was found which encompassed the whole abdomen. At laparotomy, a giant, totally cystic, vascularized and smooth mass attached to the right ovary was encountered, lying between the symphysis and the xiphoid. Ooferectomy was performed. On the postoperative second day, she was discharged without any problem. Her pathology report disclosed a 35 x 20 x 16 cm(3) serous cyst adenoma weighing 9.5 kg. This is the largest ovarian cyst that ever reported from our hospital and one of the largest among the reported cases in the literature.
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http://dx.doi.org/10.1007/s00404-005-0087-xDOI Listing
March 2006

The value of tartrate resistant acid phosphatase (TRAP) immunoreactivity in diagnosis of hairy cell leukemia.

APMIS 2005 Mar;113(3):162-6

Pathology Department, Baskent University, Medical Faculty, Alanya Medical Center, 07400 Alanya-Antalya, Turkey.

Hairy cell leukemia (HCL) is a rare chronic B-cell lymphoproliferative disorder characterized by splenomegaly, pancytopenia, and circulating atypical lymphocytes with circumferential cytoplasmic projections. We investigated the specificity and the sensitivity of anti-TRAP antibody immunoreactivity in 57 cases of HCL. We found that there is a statistically highly significant difference between TRAP immunoreactivities of the study and the control groups, and HCL can be diagnosed by TRAP immunoreactivity in bone marrow trephine biopsy materials with a specificity of 98.27 % and a sensitivity of 100%.
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http://dx.doi.org/10.1111/j.1600-0463.2005.apm1130302.xDOI Listing
March 2005