Person: KOCAKOÇ, ERCAN
Doppler ultrasonography and magnetic resonance imaging findings of testicular adrenal rest tissue in a patient with 11 beta hydroxylase deficiency. Case report
2014-12-01T00:00:00Z, Ahmad, Issam Cheikh, YILMAZ, Temel Fatih, KOCAKOÇ, ERCAN, YILMAZ, TEMEL FATİH, KOCAKOÇ, ERCAN
Benign intratesticular lesions are rare; thus, radiological diagnosis is important to avoid unnecessary surgical intervention. Testicular adrenal rest tumors (TART) are the nodular testicular lesions deriving from the adrenal remnant tissue reported in patients with congenital adrenal hyperplasia. We present ultrasonographic (US) and magnetic resonance imaging (MRI) findings of intratesticular adrenal rests in a 16-year-old patient with 11 beta hydroxylase deficiency. Scrotal ultrasonography demonstrated bilateral heterogenous hypoechoic lesions located around mediastinum testis and highly vascularized on powerDoppler US. On MRI the lesions were hyperintense on T1-weighted and hypointense on T2-weighted images and enhanced brightly on post-contrast images.
Diffusion-weighted MRI of fatty liver
2012-05-01T00:00:00Z, POYRAZ, AHMET KÜRŞAD, ONUR, MEHMET RUHİ, KOCAKOÇ, ERCAN, Ogur, Erkin, KOCAKOÇ, ERCAN
Purpose: 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.
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, ERCAN
Objective: 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, Basel
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, ERCAN
Primary 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.
Diagnosis of Peritoneal Metastases with Abdominal Malignancies: Role of ADC Measurement on Diffusion Weighted MRI
2012-12-01T00:00:00Z, ONUR, MEHMET RUHİ, Akyol, Muammer, POYRAZ, AHMET KÜRŞAD, KOCAKOÇ, ERCAN, Ogur, Erkin, KOCAKOÇ, ERCAN
Objective: The purpose of our study was to evaluate the utility of the apparent diffusion coefficient (ADC) value measurement in the diagnosis of peritoneal metastases on diffusion weighted magnetic resonance imaging.
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, ERCAN
The 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.
Utility of ADC measurement on diffusion-weighted MRI in differentiation of prostate cancer, normal prostate and prostatitis
2013-08-01T00:00:00Z, Esen, Meltem, ONUR, MEHMET RUHİ, AKPOLAT, NUSRET, ORHAN, İRFAN, KOCAKOÇ, ERCAN, KOCAKOÇ, ERCAN
To determine the utility of apparent diffusion coefficient (ADC) values in differentiation of prostate cancer from normal prostate parenchyma and prostatitis we obtained ADC values of 50 patients at b 100, 600 and 1,000 s/mm(2) diffusion gradients. The ADC values of prostate cancer group were significantly lower than normal prostate and prostatitis group at b 600 and 1,000 s/mm(2) gradients. The ADC values at high diffusion gradients may be used in differentiation prostate cancer from normal prostate and prostatitis.
Evaluation of left renal vein entrapment using multidetector computed tomography
2013-03-01T00:00:00Z, POYRAZ, AHMET KÜRŞAD, FIRDOLAŞ, FATİH, ONUR, MEHMET RUHİ, KOCAKOÇ, ERCAN, KOCAKOÇ, ERCAN
Background: Nutcracker syndrome, also called left renal vein entrapment syndrome, is a cause of non-glomerular hematuria with difficulties in diagnosis. Multidetector computed tomography (MDCT) is a powerful tool to prevent unnecessary diagnostic procedures.
The role of ADC measurement in differential diagnosis of focal hepatic lesions
2012-03-01T00:00:00Z, ONUR, MEHMET RUHİ, Cicekci, Mehtap, Kayali, Alperen, POYRAZ, AHMET KÜRŞAD, KOCAKOÇ, ERCAN, KOCAKOÇ, ERCAN
Purpose: To evaluate the utility of apparent diffusion coefficient (ADC) measurement in characterization of focal solid hepatic lesions and determine the role of ADC values in differentiation of solid benign and solid malignant hepatic lesions.
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, ERCAN