Items tagged “meningioma”

7 results found
Article

Cystic 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...
Article

Intraventricular meningioma

Intraventricular meningiomas are rare tumors usually encountered in adults and are somewhat distinct from the far more common extra-ventricular meningioma. On imaging, they classically present as vividly enhancing solid mass at the trigone of the lateral ventricles. Epidemiology Intraventricu...
Article

Meningioma

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...
Article

Optic nerve sheath meningioma

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...
Article

Orbital meningioma

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 ...
Article

Intracranial tumors (summary)

This is a basic article for medical students and other non-radiologists Intracranial tumors comprise a heterogeneous group of tumors. In adult patients, the majority represent metastatic disease with a smaller proportion being primary brain tumors. Metastasis to the brain occurs, most commonly,...
Article

Skull base meningioma

Skull base meningiomas can be located at the olfactory groove, tuberculum sella, sphenoid ridge, petroclival region, foramen magnum and jugular foramen 1.   Clinical presentation Similar to typical meningiomas, they are slowly growing and usually asymptomatic. Apart from headache, they can pre...

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