Choroid plexus carcinoma: a report of two cases and review of the literature.

Choroid plexus carcinoma is a rare intracranial neoplasm, affecting mainly very young children. The most common site of origin is within one of the lateral ventricles. The diagnosis of choroid plexus carcinoma is based on histological examination. Frequently subarachnoid seeding occurs and investigation at diagnosis should include examination of the cerebrospinal fluid and magnetic resonance imaging of the spinal cord. Extraneural metastases are rare. Prognosis for long-term survival ameliorates. Total surgical resection of the tumor should be attempted. Both radiotherapy and chemotherapy are used as adjuvant therapies for primary tumors. No clear difference in effectiveness of these therapies could be found. However craniospinal irradiation seems to be more effective when leptomeningeal seeding is present.