Pineal Region Tumors

The pineal region comprises multiple structures in and around the pineal gland of the posterior third ventricle. Heterogeneous types of tumors occur in the pineal region.Tumors of pineal and extrapineal origin di er in histologic type. Those of pineal origin are germ cell tumors and pineal parenchymal cell tumors. Extrapineal tumors arise from the surrounding neural or mesenchymal structures and include astrocytomas, meningiomas, ependymomas, and choroid plexus papillomas. Another tumor in this location with papillary features, papillary tumor of the pineal region, is considered to be derived from the subcommissural organ