Meningioma

Related pages

• Anterior skull base Meningiomas
• Cavernous sinus Meningiomas
• Parasagittal and falx meningiomas

General information

• Meningiomas are a group of tumors that are believed to originate in meningothelial cells of the arachnoid membrane.
• They may be intracranial (MC), intraorbital, or intra-spinal.

Meningioma Grades

GRADE I	GRADE II	GRADE III
Meningothelial meningioma Fibrous meningioma Transitional meningioma Psammomatous meningioma Angiomatous meningioma Microcystic meningioma Secretory meningioma Lymphoplasmacyte-rich meningioma Metaplastic meningioma	Atypical meningioma Clear cell meningioma Chordoid meningioma	Rhabdoid meningioma Papillary meningioma Anaplastic (malignant) meningioma

Diagnosis

Imaging findings

• Wide dural based
• Hyperostosis
• Dural tail
• Calcifications
• Homogeneous enhancement
• Pneumosinus dilatans
• MRI: isointense on T1WI, hypointense on T2WI

Histopathology

• The tumour cells have features of both syncytial and fibroblastic type forming whorls which contain central laminated areas of calcification called psammoma bodies.

Immunohistochemical staining

• EMA ⊕ in ~80%