Pineocytoma (WHO grade II) is a slow-growing pineal parenchymal neoplasm that primarily occurs in young adults (Mena et al. 2000a).
Pineocytomas account for less than 1% of all brain tumors and comprise approximately 45% of all pineal parenchymal tumors. Adults aged 25–35 years are most frequently affected. No specific cytogenetic abnormalities or molecular genetics exist with this tumor. The 5-year survival rate has been reported to be as great as 86%.