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Ependymomas of the Posterior Cranial Fossa:CT and MRI Findings
Neuroradiology 37:238-243, Tortori-Donati,P.,et al, 1995
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Article Abstract
We studies nine children with posterior cranial fossa ependymomas to identify specific neuroradiological features.Patients were studied preoperatively with CT and MRI;T1-,T2-and proton-density(PD)-weighted images were obtained.All children underwent surgery and a definite histopathological diagnosis was made.All the tumors grew into the fourth ventricle and caused dilatation of its upper part,which resembled a cap. All but one were separated from the vermis by a cleavage plane.In eight cases there was desmoplastic development through the foramina of the fourth ventricle,and five were heterogeneous due to necrosis and cystic change;one had a hemorrhagic area.In most cases the solid portion was isointense with grey matter on T2-weighted images,hyperintense on PD weighting,and isointense on T2-weighted images.On CT the tumor was isodense in six cases and calcification was detected in four.The presence of both desmoplastic development and a tumor/vermis cleavage plane in a posterior cranial fossa tumor isodense on CT is highly suggestive of ependymoma.
 
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