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MRI of intracranial subependymomas
J E Silverstein1, L Lenchik, M G Stanciu
1Department of Radiology, Bridgeport Hospital, CT 06610.
Objective:
We report imaging features of two cases of subependymoma, a relatively rare benign intraventricular neoplasm.
Materials And Methods:
The first case was a lateral ventricular tumor, which grew to a large size before becoming symptomatic. The second case was a fourth ventricular subependymoma with extensive cisternal spread.
Results:
In Case 1, absence of postcontrast enhancement suggested the correct diagnosis. However, in Case 2 heterogeneous enhancement made the diagnosis uncertain. In both cases, pre- and postoperative MRI was superior to other modalities in defining tumor extent and delineating the surrounding anatomy.
Conclusions:
Magnetic resonance imaging is the modality of choice for studying subependymomas. The diagnosis should be placed among differential considerations for intraventricular tumors.