Extra-axial masses
Hemisphere:
- Solid = Meningioma; Metastasis; Lymphoma; Haemangiopericytoma
- Cystic/Fluid = Arachnoid cyst; Epidermoid cyst; Extra-axial blood collections/empyema
Clival/prepontine cistern:
- Midline = Chordoma; Meningioma; Metastasis
- Paramidline = Chondrosarcoma
CPA mass:
- Vestibular Schwannoma (extends into IAC); Meningioma; Metastasis; Epidermoid cyst; arachnoid cyst.
Other extra-axial masses:
- Aneurysms
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