Pineoblastoma may occur in patients with hereditary uni- or bilateral retinoblastoma. When retinoblastoma patients present with pineoblastoma this is characterized as "trilateral retinoblastoma".  Prognosis of patients with trilateral retinoblastoma is dismal, only a few patients have survived more than 5 years after diagnosis; all survivors were diagnosed with small tumors in a subclinical stage.
Lately, this disease was featured in headlines of several newspapers all over the world in a patient without retinoblatoma.
^Kivelä T (June 1999). "Trilateral retinoblastoma: a meta-analysis of hereditary retinoblastoma associated with primary ectopic intracranial retinoblastoma". Journal of Clinical Oncology17 (6): 1829–37. PMID10561222.