Onak Kandemir N. | Dogan Gün B. | Irkörücü O. | Tokgöz H. | Barut F. | Cömert M. | Özdamar Ş.O.

Letter | 2011 | Turkish Journal of Gastroenterology22 ( 2 ) , pp.235 - 236

[No abstract available]

Bektaş S. | Barut F. | Bahadir B. | Dogan G.Ü.N.B. | Kandemir N.O. | Karadayi N. | Özdamar Ş.O.

Article | 2009 | Turkish Journal of Medical Sciences39 ( 2 ) , pp.185 - 189

Background: The aim of this study was to evaluate intraobserver and interobserver reproducibility of Fuhrman nuclear grading of renal cell carcinoma. Methods: Pathology slides from 46 cases of renal cell carcinoma were rescored by 2 pathologists according to the Fuhrman system. Both intraobserver and interobserver reproducibility were assessed using kappa statistics. Results: The initial Fuhrman grade was grade 1 in 4 of the cases (8.7%), grade 2 in 30 (65.2%), grade 3 in 11 (23.9%), and grade 4 in 1 (2.2%). After reviewing the slides by the same pathologist, grades were reassigned as follows: grade 1 in 8 cases (17.4%), grade 2 in . . .23 (50%), grade 3 in 14 (30.4%), and grade 4 in 1 (2.2%). Intraobserver reproducibility of the Fuhrman system was substantial (k = 0.66). Fuhrman grading by the second pathologist was grade 1 in 11 cases (23.9%), grade 2 in 27 (58.7%), grade 3 in 7 (15.2%), and grade 4 in 1 (2.2%). Interobserver reproducibility of the Fuhrman system was moderate (k = 0.42). Conclusions: Despite substantial intraobserver reproducibility of Fuhrman grading, moderate interobserver reproducibility and low agreement for grade 3 should be a consideration Daha fazlası Daha az

Barut F. | Onak Kandemir N. | Karakaya K. | Kökten N. | Özdamar Ş.O.

Article | 2011 | Turkish Journal of Gastroenterology22 ( 3 ) , pp.324 - 328

Multifocal and skip involvement is quite a rare developmental pattern for primary gastrointestinal lymphomas. A 25-year-old male patient with diffuse large B-cell lymphoma of the small intestine, with macroscopic features and clinical aspects imitating Crohn's disease and attracting attention with cobblestone-like appearance, is presented herein together with the clinical and pathological features. Multiple ulcerated lesions were also observed infiltrating the serosa with polypoid appearance, 2.5 cm in largest diameter, within the resected jejunoileal specimen, which displayed patchy, healthy-appearing mucosal areas. In microscopic . . .examination, a tumoral infiltration was observed comprised of pleomorphic, atypical lymphoid cells with abundant eosinophilic cytoplasm, marked nucleoli and vesicular nuclei. A B-cell phenotype immunoreaction was observed by vimentin, LCA, CD20, and CD79a in those atypical cells. The diagnosis of the case was diffuse large B-cell lymphoma.The possibility of the presence of this disorder, although rare, is emphasized here for patients applying to the hospital with the signs and symptoms of Crohn's disease Daha fazlası Daha az

Kandemir N.O. | Barut F. | Ekinci T. | Karagülle Ç. | Özdamar Ş.O.

Article | 2010 | Diagnostic Pathology5 ( 1 ) , pp.324 - 328

Barut F. | Bektaş S. | Bahadir B. | Onak Kandemir N. | Karadayi N. | Özdamar Ş.O.

Article | 2009 | Turkiye Klinikleri Journal of Medical Sciences29 ( 1 ) , pp.42 - 47

Objective: The gold standard for diagnosis of papillary thyroid carcinoma is conventional histology, which depends on the characteristic nuclear features, regardless of whether papillary architecture is present or not. This study was carried on to evaluate the utility of cytokeratin-19 in the diagnosis and differential diagnosis of papillary thyroid carcinoma. Material and Methods: Expression of cytokeratin-19 was tested on formalin-fixed, paraffin-embedded tissues from 380 surgically resected thyroid lesions including hyperplasic nodules (n= 243), granulomatous thyroiditis (n= 3), lymphocytic (n= 53) and Hashimoto's thyroiditis (n= . . . 11), follicular adenomas (n= 17), Hurthle cell adenomas (n= 4), well-differentiated thyroid tumor with follicular architecture of uncertain malignant potenti al (n= 1), papillary carcinomas (n= 45), follicular carcinoma (n= 1), insular carcinoma (n= 1), and medullary carcinoma (n= 1). The immunoreactivity was scored as negative, 1+, 2+, 3+, and 4+, based on the extent of the reaction regardless of previous diagnosis. Results: Positive reaction with cytokeratin-19 was denoted in all of the 45 cases of papillary carcino mas with scores of 4+, 3+ and 2+ and the ratios were 57.8% (26/45), 33.3% (15/45) and 8.9% (4/45), respectively. There seemed to be a strong diffuse cytoplasmic reactivity with cytokeratin-19 in papillary thyroid carcinomas. The sensitivity and specificity for cytokeratin-19 in papillary carcinomas among neoplastic thyroid lesions were 91.8% and 86.2%, respectively. Conclusion: In additi on to careful histological evaluation, cytokeratin-19 seems useful for the diagnosis of papillary thyroid carcinomas. Copyright © 2009 by Türkiye Klinikleri Daha fazlası Daha az

Bektaş S. | Bahadir B. | Barut F. | Bayar Ü. | Özdamar Ş.O.

Article | 2010 | Turkiye Klinikleri Jinekoloji Obstetrik20 ( 6 ) , pp.403 - 406

Ovarian lipoleiomyoma composed of an admixture of smooth muscle and adipose tissue is a rare mesenchymal neoplasm. A 54-year-old female patient presented with pelvic pain. Ultrasonography revealed a giant mass with cystic-solid appearance filling of the Douglas pouch. With suspicion of ovarian carcinoma, operation was performed. Gross examination of the left ovary showed a mass measuring 20 x 19 x 11 cm. Histopathologically, the tumor consisted primarily of interlacing spindle cells with scattered of mature adipose tissue. Immunohistochemically, spindle cells exhibited vimentin, smooth muscle actin and desmin positivity. Adipose cel . . .ls revealed positive reaction for S100 protein. A diagnosis of lipoleiomyoma was made. Ovarian lipoleiomyoma may mimic malignancy, both clinically and radiographically, due the the fact that it may reach a giant size and because of its heterogeneous internal structure. Copyright © 2010 by Türkiye Klinikleri Daha fazlası Daha az

Onak Kandemir N. | Bektaş S. | Barut F. | Yurdakan G. | Bahadir B. | Dogan Gün B. | Özdamar Ş.O.

Article | 2010 | Turk Patoloji Dergisi/Turkish Journal of Pathology26 ( 3 ) , pp.230 - 237

Objective: Fine needle aspiration cytology is the first step in the diagnosing breast lesions. This study evaluated factors causing false-negative and false-positive diagnoses when evaluating breast lesions using this technique. Material and Method: In this study, we retrospectively examined 511 breast diagnoses, based on Fine needle aspiration cytology specimens, made in the Medical School of Zonguldak Karaelmas University, Department of Pathology, between 2002 and 2009. Factors affecting the reliability of fine needle aspiration cytology were evaluated by comparing the cytological and biopsy diagnoses and using the clinical parame . . .ters in the diagnosis of breast lesions. Result: In our series, the sensitivity, specificity, accuracy, positive predictive value, and negative predictive value of fine needle aspiration cytology were 77%, 99%, 95%, 93%, and 95%, respectively. The false-negative diagnosis rate was 4% and the false-positive diagnosis rate was 1%. Conclusion: Sampling errors and erroneous interpretation of cellular monomorphism are the most important reasons for false-negative diagnosis results in the evaluation of breast lesions with fine needle aspiration cytology. Increased cellularity and reactive cell atypia in benign proliferative breast lesions are the most frequent reasons for false-positive diagnosis Daha fazlası Daha az

Özdamar Ş.O. | Dogan Gün B. | Barut F. | Bahadir B.

Article | 2007 | Turkiye Klinikleri Journal of Medical Sciences27 ( 1 ) , pp.16 - 20

Objective: Traumatic neuroma is an exuberant, probably non-neoplastic proliferation of a nerve occurring in response to injury or surgery. We studied six cases of traumatic neuroma with light microscopic, histochemical and immunohistochemical methods to assess the cellular compositions of these lesions. Material and Methods: Sections from the formalin-fixed parafin-embedded tissues were stained with hematoxylin-eosin, Gomori's trichrome, Verhoeff elastica-von Gieson, reticuline, and S-100 protein, Epithelial Membrane Antigen, CD34 and CD68. Results: All cases revealed large numbers of small and haphazardly arranged regenerating nerv . . .e fascicles within a densely collagenous and fibroblastic stroma. A focal chronic mononuclear cell inflammatory reaction was observed in three cases. In all cases, Gomori's trichrome revealed collagen. Axonal morphology was detected in nerve fibers histochemically by reticulin. In all cases, fascicles were stained diffusely with S-100 protein, and Epithelial Membrane Antigen showed a positive reaction in a thin band of cells surrounding the fascicles in three of the cases. CD34 positive cells were present in five cases. CD68 expressing cells were present in only in two specimens. Conclusion: In traumatic neuromas, specific staining of fascicles with S-100 protein, perineural cells reactive for Epithelial Membrane Antigen and the presence of CD34 positive cells may contribute to our understanding of their pathogenesis and differentiation of these lesions from mimickers. Copyright © 2007 by Türkiye Klinikleri Daha fazlası Daha az

Barut F. | Özdamar Ş.O. | Bektaş S. | Taşcilar Ö. | Dogan Gün B.

Article | 2010 | Turk Onkoloji Dergisi25 ( 4 ) , pp.161 - 164

The oncocytic variant of papillary thyroid carcinoma is an uncommon form of neoplasm, the clinicopathological features and biological behavior of which have not been precisely defined. The pattern of multifocal growth is an uncommon feature. The case was a 64-year-old female patient with multinodular goiter who had undergone total thyroidectomy. Microscopic examination of cross-sections of the multiple nodules revealed a tumoral lesion characterized by a predominant follicular growth pattern, and sparse, small, abortive papillary structures. Most of the tumor cells also displayed the classical nuclear features of papillary carcinoma . . ., like optically clear nuclei, overlapping of the nuclei, irregular nuclear membranes, and sparse nucleoli. Prominent nuclear grooves and intranuclear pseudoinclusions were seen in many of the neoplastic cells. Due to the presence of the characteristic nuclear features, the diagnosis was papillary carcinoma. The oncocytic variant of papillary carcinoma, although rare, appears to represent a morphologically distinctive variant of papillary cancer. © 2010 Onkoloji Dernegi - © 2010 Association of Oncology Daha fazlası Daha az

Barut F. | Özdamar Ş.O. | Bahadir B. | Dogan Gün B. | Bektaş S. | Çolak S. | Mocan Kuzey G.

Article | 2007 | Turkiye Klinikleri Journal of Medical Sciences27 ( 2 ) , pp.179 - 183

Objective: Bronchoalveolar lavage performed during bronchoscopic examination is a type of cytologic sampling with great diagnostic significance. Its diagnostic value is enhanced when biopsy is unavailable and bronchoalveolar lavage is the unique sample. Determining the diagnostic accuracy of bronchoalveolar lavage by comparing it with the diagnostic yield of synchronous biopsies is an indicator of its effectiveness. Material and Methods: In this study, 435 bronchoalveolar lavage and 273 bronchoscopic biopsy specimens obtained from January 2003 to December 2005 in the Department of Pulmonary Diseases were retrospectively evaluated in . . . the Department of Pathology, Faculty of Medicine, Zonguldak Karaelmas University. Results: Overall, 373 cases (85.8%) were diagnosed as benign and 12 cases (2.8%) were reported as malignant, while 18 cases (4.1%) were suspected to be malignant; the remaining 32 cases (7.3%) were reported as inadequate. The numbers and percentages of benign, malignant, suspected malignant and inadequate diagnoses of the 273 bronchoalveolar lavage cases with synchronous transbronchial biopsies were 229 (83.9%), 12 (4.5%), 16 (5.8%), and 16 (5.8%), respectively. After suspected malignant and inadequate samples were excluded, coomparison of cytologic and histologic diagnoses revealed that the diagnostic accuracy of bronchoalveolar lavage cytology was 79.4% and 91.6% for benign and malignant diagnoses, respectively; the rate of false negativity was 20.5% and false positivity was 8.3%. Conclusion: While sampling errors seemed to be the primary reason for false negative and false positive diagnoses, the rate of false cytologic evaluation was lower. Considering the false negative diagnoses for cases without biopsy specimens, comparison of bronchoalveolar lavage diagnoses with synchronous biopsies may serve as a quality control programme, since this condition may significantly influence the clinical course. Copyright © 2007 by Türkiye Klinikleri Daha fazlası Daha az

Onak Kandemir N. | Barut F. | Yurdakan G. | Doğan Gün B. | Birol İ.E. | Özdamar Ş.O.

Article | 2017 | Turk Onkoloji Dergisi32 ( 4 ) , pp.165 - 168

Kaposi’s sarcoma (KS) is a vascular tumor with different epidemiological, clinical, and morphologic features, and KS-associated herpes virus plays role in its etiology. In the pathogenesis of these tumors, inflammatory, immunological, and oncogenic factors are closely related to each other. Classic KS is characterized by cutaneous lesions and mild clinical course. However, with the addition of various factors to the disease process, KS lesions can occur in unusual locations and cause unexpected clinical symptoms. In this study, we present a case of gastrointestinal system involvement in KS and lymphadenopathic KS following interstit . . .ial lung disease and steroid treatment in a 72-year-old male patient who was treated for cutaneous classic KS for 10 years. Histopathologic differential diagnosis of KS lesions seen in unusual localizations is discussed in the context of literature. © 2017, Turkish Society for Radiation Oncology Daha fazlası Daha az

Barut F. | Özdamar Ş.O. | Kertiş G. | Bahadir B. | Cömert M. | Banu Dogan G.Ü.N.

Article | 2008 | Ondokuz Mayis Universitesi Tip Dergisi25 ( 1 ) , pp.30 - 34

Majority of hepatic carcinoid tumors are metastatic, and frequently the origin of the tumor is gastrointestinal system. It is occasionally regarded as primary, after long term of clinical follow up or without any incidental finding during otopsy for focus of tumor. For carcinoid tumor cases, high frequency of secondary non-carcinoid neoplasm sourced from gastrointestinal system especially colon adenocarcinoma is well known. Though, carcinoid tumor accompany with gallbladder carcinoma is extremely rare. 73 years old woman applied to the emergency service with abdominal pain. Abdominal ultrasonography and tomography revealed multiple . . .metastasis concordant with abdominal mass and after that, with the preliminary diagnosis 'acute cholecystitidis' and 'hepatic metastatic mass lesion' the patient underwent cholecystectomy and hepatic local mass exicision. A brown lesion in 1 cm diameter at the fundus is observed during macroscopic examination. Microscopic examination of this lesion showed adenocarcinoma infiltration up to serosa and focal reaction with musicarmine within the tumor cells. Immunohistochemically, there is positive reaction with pancytokeratin (AE1/AE3) with no chromogranin-A expression. Gross examination of hepatic mass lesion is solid with smooth surface and microscopic examination revealed tumor, composed of cells exhibiting organoid pattern, which has centrally located vesicular nucleus and large granular eosinophilic cytoplasm, and adjacent to normal liver tissue. Immunohistochemically, it is determined that there is weak reaction with pancytokeratin (AE1/AE3) within tumor cells and strong and diffuse expression of chromogranin-A and synaptophysin. With these findings, it is concluded that the hepatic mass is 'carcinoid tumor'. To rule out the possibility of a metastatic lesion because of its multiple quantity, further investigations are done to determine a primary focus but cannot be found. For the cases of carcinoid tumor, encountered with gallbladder adenocarcinoma, clinical course of the disease depends upon biologic behaviour of adenocarcinoma. Because of rarerity, we report the case Daha fazlası Daha az