Person: KOCAKOÇ, ERCAN
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Publication Cystic abdominal masses in children: a pictorial essay(2013-01-01T00:00:00Z) ONUR, MEHMET RUHİ; BAKAL, ÜNAL; KOCAKOÇ, ERCAN; TARTAR, TUGAY; KAZEZ, AHMET; KOCAKOÇ, ERCANCystic abdominal masses in children are not an infrequently encountered condition of childhood. These lesions usually present with large size and mimick each other with similar presenting symptoms. Imaging examinations have an important role to determine the type of the cystic abdominal masses, which is crucial for management of patients and presurgical planning. In this pictorial essay, we summarized the imaging features of common cystic abdominal masses of children, including cystic lesions arising from liver, biliary ducts, kidney, pancreas, bowel, ovary, mesentery, and miscellaneous tissues. (C) 2013 Elsevier Inc. All rights reserved.Publication Gastrointestinal Sistem Perforasyonu Olan Olgularda Bilgisayarlı Tomografi İncelemesinde Aksiyal ve Koronal Reformat Görüntülerin Tanıya Katkısı(2013-11-10T00:00:00Z) YILDIZ, ŞEYMA; TOPRAK, HÜSEYİN; AHMAD, ISAM CHEİCK; YETİŞ, HÜSEYİN; KADIOĞLU, HÜSEYİN; KOCAKOÇ, ERCAN; YILDIZ, ŞEYMA; TOPRAK, HÜSEYİN; KOCAKOÇ, ERCANPublication Assessment of Liver Fibrosis with Diffusion-Weighted Magnetic Resonance Imaging Using Different b-values in Chronic Viral Hepatitis(2015-01-01T00:00:00Z) KOCAKOÇ, ERCAN; Bakan, Ayse Ahsen; Poyrazoglu, Orhan Kursat; Dagli, Adile Ferda; Gul, Yeliz; Cicekci, Mehtap; BAHÇECİOĞLU, İBRAHİM HALİL; KOCAKOÇ, ERCANObjective: To examine the effectiveness of apparent diffusion coefficient (ADC) values and to compare the reliability of different b-values in detecting and identifying significant liver fibrosis. Subjects and Methods: There were 44 patients with chronic viral hepatitis (CVH) in the study group and 30 healthy participants in the control group. Diffusion-weighted magnetic resonance imaging (DWI) was performed before the liver biopsy in patients with CVH. The values of ADC were measured with 3 different b-values (100, 600, 1,000 s/mm(2)). In addition, liver fibrosis was classified using the modified Ishak scoring system. Liver fibrosis stages and ADC values were compared using areas under the receiver-operating characteristic (ROC) curve. Results: The study group-s mean ADC value was not statistically significantly different from the control group-s mean ADC value at b = 100 s/mm(2) (3.69 +/- 0.5 x 10(-3) vs. 3.7 +/- 0.3 x 10(-3) mm(2)/s) and b = 600 s/mm(2) (2.40 +/- 0.3 x 10(-3) vs. 2.5 +/- 0.5 x 10(-3) mm(2)/s). However, the study group-s mean ADC value (0.99 +/- 0.3 x 10(-3) mm(2)/s) was significantly lower than that of the control group (1.2 +/- 0.1 x 10(-3) mm(2)/s) at b = 1,000 s/mm(2). With b = 1,000 s/mm(2) and the cutoff ADC value of 0.0011 mm(2)/s for the diagnosis of liver fibrosis, the mean area under the ROC curve was 0.702 +/- 0.07 (p = 0.0015). For b = 1,000 s/mm(2) and the cutoff ADC value of 0.0011 mm(2)/s to diagnose significant liver fibrosis (Ishak score = 3), the mean area under the ROC curve was 0.759 +/- 0.07 (p = 0.0001). Conclusion: Measurement of ADC values by DWI was effective in detecting liver fibrosis and accurately identifying significant liver fibrosis when a b-value of 1,000 s/mm(2) was used. (C) 2015 S. Karger AG, BaselPublication Supposed to be rare cause of intestinal obstruction; abdominal cocoon: report of two cases(2013-05-01T00:00:00Z) Serter, Asli; KOCAKOÇ, ERCAN; Cipe, Gokhan; KOCAKOÇ, ERCANAbdominal cocoon, or sclerosing encapsulating peritonitis, is supposed to be rare cause of intestinal obstruction. It is characterized by totally or partially encasement of small bowel with a thick, fibrotic, cocoon-like membrane. We think this entity is not rare as previously thought. We reported two case-s clinical and imaging findings which diagnosed abdominal cocoon by surgery to increase awareness of this diagnosis. (C) 2013 Elsevier Inc. All rights reserved.Publication A rare cause of hydronephrosis: entrapment effect of giant iliac artery aneurysm(2013-09-01T00:00:00Z) SHARIFOV, RASUL; Atay, Musa; Yetis, Huseyin; KOCAKOÇ, ERCAN; SHARIFOV, RASUL; KOCAKOÇ, ERCANPublication The role of apparent diffusion coefficient values in differentiation between adrenal masses(2014-03-01T00:00:00Z) Cicekci, Mehtap; ONUR, MEHMET RUHİ; Aydin, Ayse Murat; Gul, Yeliz; ÖZKAN, YUSUF; AKPOLAT, NUSRET; KOCAKOÇ, ERCAN; KOCAKOÇ, ERCANThe aim of this study was to evaluate the utility of apparent diffusion coefficient (ADC) values in differentiation between solid adrenal masses. The ADC values of 73 adrenal lesions (54 benign, 19 malignant) in 69 patients were measured at b 100, 600 and 1000 gradients on diffusion-weighted magnetic resonance imaging (DW-MRI). No statistically significant difference was found between ADC values of benign and malignant adrenal masses, nonadenomatous benign adrenal masses and malignant adrenal masses, adrenal adenomas and nonadenomatous lesions, adenomas and metastases, adenomas and pheochromocytomas, metastases and pheochromocytomas. ADC values are not helpful in the differentiation between solid adrenal masses. (C) 2014 Elsevier Inc. All rights reserved.Publication An unusual liver mass: primary malignant mesothelioma of the liver(2015-02-01T00:00:00Z) Serter, Asli; BÜYÜKPINARBAŞILI, NUR; Karatepe, Oguzhan; KOCAKOÇ, ERCAN; BÜYÜKPINARBAŞILI, NUR; KOCAKOÇ, ERCANPrimary malignant mesothelioma of the liver is extremely rare, and radiologic features have been defined in only one case. We present radiologic findings of two cases which are pathologically proven as primary malignant mesothelioma of the liver. Malignant mesothelioma of the liver may be included in a differential diagnosis list if there is a heterogeneous, hemorrhagic and necrotic lesion in the liver, with peripheral serpiginous vascular structures and increasing septal enhancement in post-contrast images.Publication Role of Diffusion MRI and Apparent Diffusion Coefficient Measurement in the Diagnosis, Staging and Pathological Classification of Bladder Tumors(2011-01-01T00:00:00Z) Daggulli, Mansur; ONUR, MEHMET RUHİ; FIRDOLAŞ, FATİH; Onur, Rahmi; KOCAKOÇ, ERCAN; ORHAN, İRFAN; KOCAKOÇ, ERCANObjectives: Our aim was to investigate the role of simultaneous apparent diffusion coefficient (ADC) measurement and diffusion-weighted MRI (DWMRI) in the diagnosis and differentiation of bladder masses. Methods: We examined 45 patients presenting with hematuria by dynamic and diffusion MRI (at b100, b600, b1000 gradients) and cystoscopy. Thirty healthy volunteers without hematuria were also included in the study. Results from imaging techniques were compared to cystoscopic and histopathologic findings. The ADC values of benign and malignant bladder masses, and bladder tissue in healthy subjects were measured and compared with each other. Results: The mean ADC values of benign (n = 10) and malignant lesions (n = 35) were significantly lower than the mean ADC values of adjacent bladder walls and bladder walls of healthy subjects at all 3 gradients (p 0.05). Mean ADC values of invasive tumors were significantly lower than superficial malignancies at b600 and b1000 gradients. The mean ADC values of transitional cell tumors were significantly higher than squamous cell tumors at b100 and b600 gradients. Conclusion: Simultaneous measurement of ADC and DWMRI provided useful information in the diagnosis, staging and histopathological classification of bladder tumors. Copyright (C) 2011 S. Karger AG, BaselPublication Diffusion-weighted MRI of fatty liver(2012-05-01T00:00:00Z) POYRAZ, AHMET KÜRŞAD; ONUR, MEHMET RUHİ; KOCAKOÇ, ERCAN; Ogur, Erkin; KOCAKOÇ, ERCANPurpose: To investigate the effect of fat infiltration on the apparent diffusion coefficient (ADC) of liver, and assess the relationship between ADC and hepatic fat fraction (HFF). Materials and Methods: MRI scans of 120 consecutive patients were included in this retrospective study. Of these, 42 patients were included in the fatty liver group and 78 in the control group. ADC values were measured from a pair of diffusion-weighted (DW) images (b 0 mm(2)/s and 1000 mm(2)/s). HFFs were measured using T1W GRE dual-echo images. The difference between the ADCs of the two groups was assessed with the t-test. The relationship between HFF and ADC was determined using linear regression analysis and the Pearson correlation coefficient (r). Results: Mean HFFs were 0.85 +/- 2.86 and 13.67 +/- 8.62 in the control and fatty liver groups, respectively. The mean ADC of fatty liver group 1.20 +/- 0.22 x 10 (-3) mm (2)/s was significantly lower than that of the control group 1.32 6 0.23 x 10(-3) mm (2)/s (P = 0.02). Linear regression analysis revealed an inverse relationship between ADC and HFF (r = 0.39, P 5% HFF, and ADC and HFF exhibit an inverse relationship. Key Words: MRI; diffusion-weighted; fatty liver; imaging; chemical shift J. Magn. Reson. Imaging 2012; 35: 1108-1111. (C) 2011 Wiley Periodicals, Inc.Publication Role of the apparent diffusion coefficient measurement by diffusion weighted magnetic resonance imaging in the diagnosis of Fasciola hepatica in the liver(2011-12-01T00:00:00Z) ONUR, MEHMET RUHİ; Cicekci, Mehtap; Kayali, Alperen; KOCAKOÇ, ERCAN; Aygun, Cem; KOCAKOÇ, ERCANPurpose. The aim of this study was to investigate the diagnostic role of the apparent diffusion coefficient (ADC) measurement in the diagnosis of focal parenchymal lesions and to understand the discriminating role of the ADC value for differentiating Fasciola lesions from other focal liver lesions.