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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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ataxia ataxia,truncal calcification,intracranial CAT scan CAT scan,abnormal cerebellar pontine angle cerebellar pontine angle tumor children cisterna magna cranial nerve palsies ependymoma fourth ventricle,enlargement of fourth ventricle,neoplasm of intracranial pressure,increased meningismus MRI MRI,abnormal neoplasm,posterior fossa neoplasm,primary of CNS neoplasm,primary of CNS-children review article torticollis
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