“…If left untreated the tum or m ay destroy the eye, but because of its visibility it is usually diagnosed early and local removal then has a good prognosis [10, 11J. Van der Hoeve defined von Recklinghausen's, Pringle-Hourneville's, von Hippel-Lindau's and Sturge-W eber's diseases as a group of congenital, sometimes familial and hereditary affections, characterised by a syndrome of nevoid changes developing in the skin, eyes and central nervous system and introduced the term phacomatosis. Hermans, Grosfeld, Valk and Spaas [12,13,14] consider the basal cell nevus syndrome to be a fifth phacomatosis because of its congenital and familial occurrence, and variously combined changes in the skin, eyes, central nervous system and other organs. The finding of a malig nant melanoma of the iris may favor this concept.…”