[Pseudoretinoblastoma. Differential diagnosis of retinoblastoma].

Between 1958 and 1988, at the ophthalmopathological laboratory of Utrecht University, different diseases were found in 60 eyes of 59 patients with the clinically established or tentative diagnosis of retinoblastoma. In this collection of extremely heterogeneous cases of pseudoretinoblastoma congenital malformations accounted for around 50% of the cases, inflammatory conditions for 35% and other diseases, including other tumors, for 15%. Modern examination and treatment methods have brought about a considerable reduction in the number of such cases.