Yazar "Unal B." seçeneğine göre listele

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    Anatomic variations of the colon detected on abdominal CT scans
    (2004) Unal B.; Kara S.; Aktaş A.; Bilgili Y.
    PURPOSE: The frequency of anatomic variations of the colon detected on abdominal CT scans was examined. MATERIALS AND METHODS: 296 consequtive abdominal tomography were evaluated prospectively for the presence of retrorenal colon, retrogastric (pancreaticogastric interposition or retrosplenic) colon, high positioned colon, interposition of the colon between the psoas muscle and the kidney and hepatodiaphragmatic interposition (anterior or posterior). RESULTS: We observed 2 retrogastric colon [1 pancreaticogastric (0.3%), 1 retrosplenic (0.3%)], 7 retrorenal colon (1.2%) being bilateral in two cases, 2 interposition of colon between the psoas muscle and the kidney (0.7%), 1 posterior (0.3%) and 6 anterolateral hepatodiaphragmatic interposition (2.1%) and 12 high positioned cecum (4.2%) (in 4 of them cecum was totally subhepatic in location). Terminal ileum was lying in Morrison's pouch and anterior to renal hilus in two of the cases with subhepatic cecum. CONCLUSION: Anatomic variations of the colon probably result due to mild embryologic abnormalities of bowel rotation and fixation, short transvers mesocolon, intraperitoneal ascending or descending colon, increased intraperitoneal pressure or decreased retroperitoneal fat. Pancreaticogastric interposition occurs in approximately 0.2%, partial retrorenal colon in 9-10%, complete retrorenal colon 1%, interposition between psoas muscle and kidney in 0.7-1.7%, anterolateral hepatodiaphragmatic interposition in 1.3-3% of individuals. When located in lesser sac it simulates several pathologies of this area. On intravenous urography images it may cause mass effect. In percutaneous interventions and surgical procedures colon may be perforated. For these reasons tomography images should be evaluated for the presence of these anatomic variations.
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    The effect of aging on the apparent diffusion coefficient of normal appearing white and gray matter
    (2004) Karadeniz Bilgili Y.M.; Unal B.; Kendi T.; Simşir I.; Erdal H.; Huvaj S.; Kara S.
    PURPOSE: To test if the apparent diffusion coefficient (ADC) values reflect the ultrastructural changes of normal appearing white and gray matter with advancing age. MATERIALS AND METHODS: We selected 45 patients with normal MRI and DW imaging findings. DW and MRI imaging was performed and for each patient the average ADC on trace images of the frontal and occipital white matter and the thalamus were compared with increasing patient age. RESULTS: The average ADC value was 0.753+/-0.054 x 10-3 mm2/sec in frontal white matter, 0.673+/-0.085 x 10-3 mm2/sec in occipital white matter, and 0.763+/-0.063 x 10-3 mm2/sec in the thalamus. For white matter, ADC values increased with advancing age. Although ADC tended to increase with age, comparison of individual thalamic ADC and patient ages did not reach statistical significance. CONCLUSION: Advancing age is associated with a small but statistically significant increase of water diffusibility in human white matter. This increase may reflect mild structural changes with normal aging.
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    Giant dedifferentiated retroperitoneal liposarcoma: CT and MRI findings
    (Elsevier BV, 2004) Unal B.; Bilgili Y.K.; Batislam E.; Erdogan S.
    We present computed tomography, magnetic resonance imaging and pathologic findings of a 52-year-old female with a giant dedifferentiated retroperitoneal liposarcoma in which well differentiated lipoma-like and dedifferentiated components are found together. Dedifferentiated components of the mass showed various degrees of enhancement and revealed no suppression with fat saturation techniques. The diagnosis of dedifferentiated liposarcoma should be kept in mind when a mass is found with retroperitoneal localization, intense of contrast enhancement, calcifications, invasion of adjacent tissues, necrosis and haemorrhage, and the absence of fat suppression. © 2004 Elsevier Ireland Ltd. All rights reserved.