Congenital hypertrophy of retinal pigment epithelium Clustered congenital hypertrophy of retinal pigment epithelium UMLS:C4072989 Grouped congenital hypertrophy of retinal pigment epithelium This is a benign finding, which should be distinguished from the multiple pigmented lesions associated with familial polyposis. Grouped, flat, well-demarcated pigmented lesions at the level of the pigment epithelium (that are said to resemble bear tracks). Less frequently, the lesions may be white ('polar bear tracks'). Bear track congenital hypertrophy of retinal pigment epithelium