Items tagged “meningioma”

The term cystic meningioma is applied to both meningiomas with intratumoral degenerative cyst formation as well as those with peritumoral arachnoid cysts or reactive intraparenchymal cysts.  They should not be confused with microcystic meningiomas, a distinct variant, in which the cysts are mic...

Intraventricular meningiomas, although are rare intracranial tumors, are a common type of intraventricular neoplasm in adults. They account for less than 3% of all meningiomas.  On imaging, they classically present as vividly enhancing solid mass at the trigone of the lateral ventricles. Epide...

Meningiomas are extra-axial tumors and represent the most common tumor of the meninges. They are a non-glial neoplasm that originates from the meningocytes or arachnoid cap cells of the meninges and are located anywhere that meninges are found, and in some places where only rest cells are presum...

Optic nerve meningiomas are benign tumors arising from the arachnoid cap cells of the optic nerve sheath and represent ~20% of all orbital meningiomas, the majority of which are direct extensions from intracranial meningiomas.  These tumors typically appear as masses within the optic nerve, iso...

Meningiomas of the orbit are uncommon. They can be divided into two broad categories: primary orbital meningioma (a form of ectopic meningioma) almost all are optic nerve meningiomas rarely ectopic rests of arachnoid cells give rise to orbital meningiomas separate from the optic nerve sheath ...