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Öğe 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.Öğe 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.Öğe Long-term MRI findings of a case with persistent hyperinsulinemic hypoglycemia of infancy (nesidioblastosis)(2006) Aliefendioglu D.; Bademci G.; Kara S.Background and purpose: To describe the sequential magnetic resonance imaging (MRI) findings in a neurologically handicapped newborn who had been suffered from neonatal hypoglycemia due to persistent hyperinsulinemic hypoglycemia of infancy (nesidioblastosis) and to evaluate the following changes in the long-term radiological follow-up. Case: A case of newborn with severe hypoglycemia due to nesidioblastosis is reported. The patient was presented with poor feeding, irritability, and seizures. Nesidioblastosis was diagnosed on the basis of high intravenous glucose requirement, high insulin to glucose ratio, negative urinary ketones. Normoglycemia was maintained by a combined treatment including glucose infusions and steroid, and then somatostatin analoques. The patient was assessed neurologically and radiologically by sequential cerebral MRI within 2 years follow-up. Results: The most striking findings were cystic lesions on corona radiata, parietooccipital deep white matter and diffuse subcortical involvement of the brain at the initial MRI. The lesions were recovered radiologically at the 5 months of age. Diffuse hyperintensity of the periventricular white matter and optic radiation suggests abnormal and delayed myelination at 1 year of age, and periventricular leukomalacia and ventricular irregularity at 2 years of age. More delayed neurologic sequelae included mental retardation and spasticity. Conclusion: Neonatal hyperinsulinemic hypoglycemia must be suddenly and appropriately diagnosed and treated to prevent any further neurological dysfunction and damage. MRI studies are crucial in nesidioblastosis to define the characteristics and severity of cerebral lesions after hypoglycemia. Long-term radiologic follow-up should be further investigated to predict the neurologic outcome, although the radiologic recovery period was seen in acute or subacute phase of the disease. © 2006 Elsevier Ireland Ltd. All rights reserved.Öğe Transient arterial enhancement in a hepatic peritumoral fat-spared area(2005) Ünal B.; Bilgili Y.; Kara S.; Erdal H.H.Early-enhancing areas that are perfusion abnormalities rather than tumor deposit are sometimes encountered on arterial dominant-phase images in multisection dynamic magnetic resonance imaging. Focal sparing in diffusely fatty liver is also a well recognized entity. However, both conditions occasionally create problems in the diagnosis of hepatic mass lesions. Familiarity with these abnormalities on ultrasonography and multisection dynamic magnetic resonance images is important to prevent misinterpretation of these pseudolesions as real masses. In addition, focal sparing can be the only clue for a space occupying lesion in the liver. We present here the ultrasonography and magnetic resonance imaging findings of a case with liver metastasis from pancreas cancer which caused a wedge-shaped fat-spared enhancing area on dynamic magnetic resonance imaging. © Turkish Society of Radiology 2005.Öğe The use of computed tomography to determine femoral component size: A study of cadaver femora(2005) Uslu M.; Ozsar B.; Kendi T.; Kara S.; Tekdemir I.; Atik O.S.Computed tomography is used to assess whether ideal femoral component size in knee arthroplasty can be made more accurately. Ideal femoral component size was measured on radiography, computed tomography, and by direct measurement of 20 cadaver femora and analyzed statistically. There was no significance between the tomographically anticipated ideal femoral component size and ideal femoral size values (Wilcoxon W 388.5; p 0.565). There was difference between radiographically anticipated ideal femoral size and ideal femoral size values (Wilcoxon W 324.5; p 0.020). Anticipating the ideal femoral size can be made more precisely with computed tomography than radiographs in cadaver femora. Anticipating the ideal femoral component size by computed tomography may solve the problems in "in-between sizes." Future total knee designs may be manufactured in more anatomic sizes.
