Choroid plexus papilloma
A Choroid plexus papilloma (CPP) is a rare, slow-growing, histologically benign tumor that is commonly located in the ventricular system of the choroid plexus. It may obstruct the cerebrospinal fluid flow, causing increased intracranial pressure. It most commonly affects young children under the age of 5. If it undergoes malignant transformation it is called if is called a choroid plexus carcinoma.