[The relationship of the lesions in choroidal benign nevus-malignant melanoma]

The paper presents the case of a 67-year-old female patient with an old posterior choroidal nevus, which has became malignant later. Microscopically, at the periphery of the malignant melanoma, long benign melanic cells are revealed, with nuclei centrally disposed and net cellular limits. The pigmentation of these cells, in parallel sequences of 4-5 rows each, is intense. The external part of the choroid, which has a regular aspect, is continued with B-type malignant cells. Finally, the origin of the malignant melanoma, derived from preexistent nevi, is discussed.