Lipoblastic Meningioma

Findings:

Multiple MR images demonstrate a T1 hyperintense mass contiguous with the lateral margin of the right cavernous sinus, associated with signal dropout on fat suppressed FLAIR sequence. There is a small amount of contiguous plaquelike abnormal enhancement along the lateral margin of the right cavernous sinus. There is no diffusion restriction in this region. The mass is well-defined and appears extra axial.

Discussion/Differential Diagnosis:

DDx: Lipoma, Dermoid, Meningioma.

While there is no histologic diagnosis yet on this case, the presence of associated extraaxial enhancement raises the possibility of a rare lipoblastic subtype of meningioma which histologically will show metaplasia into adipocytes with large fat droplets

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