Pineocytomas are composed of a uniform population of tumor cells resembling normal pineal gland (only more hypercellular). Necrosis is usually absent and mitotic activity is low. Pineocytomas have excellent prognosis with a 5-yr survival rate of about 85%. Courtesy of: Dr. Luciano de Souza Queiroz, Dept. of Pathology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), Campinas, São Paulo State, BRAZIL. Additional images are here.