Choroid plexus carcinoma is a rare and highly aggressive malignant type of choroid plexus tumor (see this term) occurring almost exclusively in children, presenting with cerebrospinal fluid obstruction in the lateral ventricles (most common), the fourth and third ventricles or in multiple ventricles, leading to hydrocephalus and increased intracranial pressure, and manifesting with nausea, vomiting, abnormal eye movements, gait impairment, seizures and enlarged head circumference.

Hydrocephalus is an active distension of the ventricular system of the brain resulting from inadequate passage of CSF from its point of production within the cerebral ventricles to its point of absorption into the systemic circulation.