Hydrocephalus due to overproduction of CSF is rare and it exactly happens with choroid plexus papilloma.

An imaging Auntminnie, it is seen as a cauliflower like lobulated mass lesion within the trigone of lateral ventricle with papillary margins. Average age of presentation around 2 years.

Intralesional hemorrhage and calcifications are not uncommon.

Intense and homogenous enhancement is the rule.

characteristic choline peak