[Retinoblastoma as a diagnostic problem in a 16-years-old boy (author's transl)].

A secondary glaucoma due to an intraocular tumour with retinal detachment in a 16-years-old patient whose brother had died of suspected leucaemia illustrates the difficulties in the clinical diagnosis at this age. Although the ophthalmoscopical appearance was that of Coats's lesion a malignant melanoma of the choroid could not be ruled out. The histopathological examination revealed a retinoblastoma.