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True fourth ventricular meningiomas are rare.We report two cases,one with typical CT,angiographic,and magnetic resonance(MR)appearances and one with atypical features of central cyst formation on CT and MR.The utility of MR in demonstrating intraventricular location in three imaging planes is illustrated.Given the rarity of these tumors,atypical features may preclude accurate preoperative diagnosis,even with MR. |
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CAT scan
CAT scan,abnormal
fourth ventricle,neoplasm of
meningioma
meningioma,cystic
meningioma,intraventricular
MRI
MRI,abnormal
neoplasm,primary of CNS-intraventricular
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