Osseous choristoma of the choroid. A familial disease.

Two patients in the same family (daughter and mother) had osseous choristoma of the choroid in four otherwise normal eyes. The clinical diagnosis of the choroidal lesion was confirmed by B-scan ultrasonography. Both patients were followed up for five years and neither showed any essential change of the fundus. The high prevalence of this choroidal tumor in girls and women (20 of 22 reported cases) and the present report on two patients in the same family suggest that a hereditary factor should be considered in the etiology of this unusual choroidal lesion.