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Pineal Region Neoplasm
Definition 1
Neoplasms that are located in the pineal gland. These neoplasms arise either from pineal parenchymal cells (pineocytes), as do pineocytomas and the more aggressive pineoblastomas, or from other cell types, as do pineal astrocytic tumors (notably pilocytic astrocytomas) and germ cell tumors. Clinical symptoms include neuro-ophthalmologic dysfunction, changes in mental status, dysfunction of the brain stem, and hypothalamic-based endocrine abnormalities. --2004 (NCI Thesaurus)
Definition 2
A type of brain tumor that occurs in or around the pineal gland, a tiny organ near the center of the brain. (NCI Dictionary)
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