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    ARACHNOID GRANULATIONS: FREQUENCY AND DISTRIBUTION IN MULTI-DETECTOR ROW CT OF DURAL SINUSES
    (Taylor & Francis Ltd, 2009) Bayrak, A. H.; Akay, H. O.; Ozmen, C. A.; Senturk, S.
    Arachnoid granulations ore normal variants that protrude into the cerebral venous sinus lumen and produce focal defects in cerebral venography, contrast enhanced CT and MRI. It should be differentiated from other lesions within the dural sinus lumen that produce focal defects. In the present study, we investigated the frequency and positional distribution of arachnoid granulations with multi-defector row CT Simple post processing procedures on thin slice multi-detector row CT were performed. We found arachnoid granulations in nearly half of our participants. We observed that presence of arachnoid granulations showed no tendency in two sexes. No relationship between age and multiplicity, and an inverse relationship between age and the variants size existed. We concluded that as imaging technology continues to develop, the frequency with which normal variants are identified will also increase. Arachnoid granulations are a normal variant that all radiologists should be aware of and which should not be mistaken for pathological intra-sinus lesions. The relationship between characteristics of the variant (presence, number, size) and of the human subjects (gender, age) should be reviewed with larger samples.
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    Öğe
    Evaluation of pericardial sinuses and recesses with 2-, 4-, 16-, and 64-row multidetector CT
    (Springer, 2010) Ozmen, C. A.; Akpinar, M. G.; Akay, H. O.; Demirkazik, F. B.; Ariyurek, M.
    Purpose. The aim of this study was to describe visualisation rate and appearance of all pericardial sinuses and recesses and to evaluate whether there is a significant difference between visualisation of these sinuses and recesses on 2-, 4-, 16- and 64-slice multidetector computed tomography (MDCT). Materials and methods. We retrospectively analysed 588 MDCT scans of the chest obtained with a protocol for pulmonary embolism. Results. The visualisation rate of any pericardial recess was 85.2%. The rates on 2-, 4-, 16- and 64-slice MDCT were 74.7%, 90.6%, 90.3% and 88.7%, respectively. There was a statistically significant difference in visualisation rates of pericardial recesses between 2-slice MDCT and other MDCT systems (p<0.01). Age, and 4-, 16- and 64-slice MDCT versus 2-slice MDCT and the presence of pleural effusion appeared as significant predictors of the presence of any recess. Conclusions. Visualisation rates of pericardial recesses are higher with 4-, 16- and 64-slice MDCT than with 2-slice MDCT. Therefore, radiologists need to be familiar with the different appearances of pericardial recesses on MDCT to avoid misdiagnosis.