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58 year-old female with hydrocephalus.

Choroid plexus papilloma

Ependymoma

Meningioma

Metastasis.

Lobulated masses projecting into the ventricular system from a region of choroid plexus.

Expand, can even trap, the ventricle from which they arise.

Can show regions of heavy calcification, hemorrhage, and/or cystic change

Hydrocephalus frequent

Pathway blockage from tumor, adhesions

CSF overproduction.

Distribution:

40% - 4th ventricle (adults)

10% - 3rd ventricle

43% - one of the lateral vents (children)

4% - multifocal sites of origin.

CT

75% iso-hyperdense pre-contrast

25% punctate Ca+

Homogenous enhancement

MR

Mottled iso-hypointense T1, herterog T2 hyperintensity

Homogenous enhancement

+/- flow voids, Ca+.

Surgical resection

5-year survival approaches 100%.