- most common are meningioma and schwannoma
- associated with NF type II.
- Hormone sens, so can grow during pregnancy.
- Radiation induced meningioma tends to be multiple
- Most common location: supratentorial.
- commonly iso-hyperdense to underlying brain parenchyma
- if given contrast, will homogenous enhance
- pneumosinus dilatans may associated with anterior skull meningioma
Pneumosinus dilatans: enlarged paranasal sinus
- CSF cleft sign: non-CSF tumour-brain interface (classically thought as a CSF-tumour interace, but often appears bright in FLAIR)
- Dural tail sign: thickened dural mater adjacent to the mass
- Spokewheel vascular appearance
- T1: iso-hypointense
- T2: iso-hyperintense
- T1 C+: being an extra-axial tumour, enhances as it lacks blood-brain barrier.
Typical appearance of meningioma with CSF cleft sign and dural tail sign.