NCIt definition : An inherited malignant tumor that originates in the nuclear layer of the retina. A
predisposition to retinoblastoma has been associated with 13q14 cytogenetic abnormalities
affecting the RB1 gene. Patients with the inherited form appear to be at increased
risk for secondary non-ocular malignancies such as osteosarcoma, malignant fibrous
histiocytoma, and fibrosarcoma.;