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    Basal ganglia involvement in the late stage of vacuolating megalencephalic leukoencephalopathy
    (2005) Karakas H.M.; Firat A.K.; Yakinci C.; Kahraman B.
    Vacuolating megalencephalic leukoencephalopathy is a recently defined entity characterized by swelling of white matter, subcortical cysts in fronto-temporal regions and slow progression of neurological symptoms that contrasts with the severity of radiological findings. We present a late follow-up of a case with vacuolating megalencephalic leukoencephalopathy. There was an improvement of the brain swelling and associated sulcal enlargement. Of notice was basal ganglia involvement which has not been described previously.
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    Dynamic contrast-enhanced magnetic resonance imaging findings of mass lesions of the pontocerebellar angle
    (2007) Firat A.K.; Karakaş H.M.; Kahraman B.; Firat Y.; Altinok T.; Kızılay, Ahmet
    OBJECTIVES: The differential diagnosis of mass lesions of the pontocerebellar angle is not always possible by conventional magnetic resonance imaging (MRI). In this study, we investigated the role of dynamic contrast-enhanced MRI in the differential diagnosis of acoustic neurinoma, meningioma, and paraganglioma. PATIENTS AND METHODS: Twelve patients (8 females, 4 males; mean age 47.5 years; range 8 to 71 years) whose diagnoses were acoustic neurinoma (n=3), paraganglioma (n=5), and meningioma (n=4) were evaluated by simultaneous conventional and dynamic contrast-enhanced MRI. Prior to postcontrast T1-weighted images, dynamic MRI was obtained. On these images, maximum contrast enhancement (Cmax) and time to peak enhancement (Tmax) were calculated at 15 different time points. Time-signal intensity curve patterns of the lesions were compared. RESULTS: According to the four main time-signal intensity curve patterns described in the literature, acoustic neurinomas, meningiomas, and paragangliomas exhibited type C, type A-B, and type A curve patterns, respectively. CONCLUSION: Our results suggest that dynamic contrast MRI may have an additional but limited role in the differential diagnosis of extra-axial intracranial tumors such as those of the pontocerebellar angle.
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    Giant sinus of valsalva aneurysm
    (AVES İbrahim KARA, 2006) Karakaş H.M.; Kahraman B.; Sa?ir A.; Firat A.K.
    [No abstract available]
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    Spontaneous intracranial hypotension with pituitary adenoma
    (Springer Milan, 2006) Firat A.K.; Karakas H.M.; Firat Z.Y.; Kahraman B.; Erdem G.
    Spontaneous intracranial hypotension (SIH) is an unusual syndrome that is characterised by positional headache, neck rigidity, nausea and vomiting. The characteristic magnetic resonance imaging (MRI) findings are diffuse smooth pachymeningeal thickening and enhancement, downward displacement of posterior fossa structures and pituitary gland enlargement. An unusual case of SIH with pituitary macro-adenoma and subsequent subdural haemorrhage is presented, and its clinical picture, MRI findings and possible pathophysiological mechanism are discussed. © Springer-Verlag Italia 2006.