Meningioma

Click on thumbnails to see enlarged pictures.

Panel A: In this T1-weighed image, A large meningioma (T) involving the base of the brain is present. The tumor is separated from the brain parenchyma (arrow head). Different part of the brain have different incidence of meningioma. The most common site is the falx cerebri and the convesity of the brain, followed by the sphenoid wing and olfactor grove. The sellar and suprasellar area as well as cavernous sinus are also common. The less common sites are the foramen magnum and cerebellar pontine angle. The least common sites are the sheath of the optic nerve, intraventricular location, and extradural locations.
Panel B: The meningioma is attached to the dura. The cut surface of meningioma is often granular as illustrated here. Some of them may be contain substantial calcification.

Panel B is courtesy of Dr. John Q. Trojanowski.

For Comment: KarMing-Fung@ouhsc.edu