Neuroradiology Teaching File

Meningioma

Non-constrast study shows a subtle hyperdense round mass in the right cerebellopontine angle.

The contrast enhanced CT shows uniform enhancement. There is mass effect on the fourth ventricle.

Meningioma is the most common primary nonglial tumor. It is also the most common intracranial extraaxial tumor. Occurring more often in women, these tumors are usually found incidentally, with only 10% causing symptoms (seizure and hemiparesis). Meningiomas are seen along the falx cerebri, cerebral convexity, sphenoid ridge, olfactory groove, parasellar region, and posterior fossa.

On CT, the characteristic appearance is a well defined round or smoothly lobulated mass that abuts a dural surface. Most are hyperdense. There is strong uniform enhancement after IV contrast administration.

Case prepared by Steven Lee, M.D. and Anthony L. Alcantara, M.D.

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