Retinal pigmentation due to choroidal melano-sarcoma with observations on congenital grouped pigmentation of the retina.

A FORM of grouped pigmentation of the retina may occur in association with detached retina due to choroidal melano-sarcoma and, when present, is probably diagnostic of this disease. Grouped pigmentation of the retina also occurs as a congenital stationary condition. Two cases of the former and three of the latter are presented below. Evidence is given that both forms of pigmentation may be due to deposition of pigment epithelial cells on the posterior surface of the retina from circulating subretinal fluid.