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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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