Meningioma

Related pages

• Anterior skull base Meningiomas
• Cavernous sinus 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

Parasagittal and falx meningiomas

Sindou grading

Grading of meningioma invasion to SSS

• Type I - attachment to lat. wall of sinus.
• Type II - invasion of lat. recess.
• Type III - invasion of lat. wall.
• Type IV - invasion of lat. wall & roof.
• Type V - total sinus occlusion, contral. wall spared.
• Type VI - total sinus occlusion, invasion of all walls.
  

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.