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    Efficacy of diffusion-weighted MRI in the differentiation of all liver hydatid cyst types
    (Wiley, 2016) Koken, Deniz; Cagli, Bekir; Tuncel, Sedat Alpaslan; Sengul, Ersin; Yilmaz, Erdem; Unlu, Mehmet Ercument
    IntroductionThe aim of this study was to evaluate the efficacy of diffusion-weighted images (DWIs) in the differentiation of hydatid cysts (HCs) of the liver. MethodsIn this prospective study, 54 patients with 92 HC lesions were evaluated. The mean apparent diffusion coefficient (ADC) values of each lesion were calculated using the ADC maps derived from the DWIs at b-values of 50, 500 and 1000s/mm(2). We compared the mean ADC values of the different HC types, which had already been classified using the sonographic criteria. A receiver operator curve (ROC) analysis was used for determining the diagnostic performance of the ADC values of the HC types. ResultsWhen the mean ADC values of each type of HC were compared using each of the b-values, no statistically significant differences were obtained between (cystic echinococcosis) CE1 and CE2 or CE3, CE2 and CE3, CE3 and CE4, or CE4 and CE5. In addition, the mean ADC values of CE1 and CE2 were significantly higher than those of CE4 and CE5. For discrimination between types CE1, CE2 and CE3, and types CE4 and CE5, the sensitivity and specificity values were, respectively, 75.9 and 89.5 for the b50 DWI, 87.0 and 86.8 for the b500 DWI, and 75.9 and 89.5 for the b1000 DWI in the ROC analysis. ConclusionDiffusion-weighted imaging may be useful for providing additional data to determine the type of HC, and for differentiating types CE1, CE2 and CE3 from types CE4 and CE5.
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    Lumbar Opening Pressure and Radiologic Scoring in Idiopathic Intracranial Hypertension: Is There Any Correlation?
    (Int Scientific Information Inc, 2017) Tuncel, Sedat Alpaslan; Yilmaz, Erdem; Cagli, Bekir; Tekatas, Aslan; Celik, Yahya; Unlu, Mehmet Ercument
    Background: To investigate correlation between lumbar opening pressure (LOP) and radiological scores based on cranial MRI and contrast-enhanced MR venography in patients with idiopathic intracranial hypertension (IIH). Material/Methods: Patients with IIH who underwent brain MRI and contrast-enhanced MR venography before measurement of LOP between 2010-2014 were evaluated retrospectively. Three experienced radiologists (blinded to LOP values) evaluated a total of 51 patients. They reached a consensus on the presence or absence of 6 radiological findings identified in the literature as characteristic for IIH: empty sella, perioptic dilation, optical tortuosity, flattening of the posterior globe, swelling of the optic disc, and bilateral transverse sinus stenosis. The radiological score was obtained by giving 1 point for the presence of each finding, with the highest possible score of 6 points. The correlation between the calculated radiological scores and LOP was evaluated. Results: There was no significant correlation between LOP and radiological scores (r=0.095; p=0.525, Spearman's rank coefficient). Similarly, no significant correlation was detected between LOP and each of the radiological findings (partial empty sella [p=0.137], perioptic dilation [p=0.265], optical tortuosity [p=0.948], flattening of the posterior globe [p=0.491], swelling of the optic disc [p=0.881], and bilateral dural sinus stenosis [p=0.837], Mann-Whitney U test). Conclusions: There was no significant correlation between LOP and reliable radiological features of IIH.