Choroidal osteoma.

The choroidal osteoma is a benign, ossifying tumor of the choroid that typically is found in young, healthy women in the second or third decade of life. Its pathogenesis is unknown. This tumor is clinically unilateral in 75% of cases and tends to be located in the juxtapapillary region. Choroidal neovascularization may occur in up to one-third of cases. The choroidal osteoma must be differentiated from other intraocular tumors as well as cases of dystrophic and metastatic calcification. Ultrasonography and computed tomography may help in the diagnosis by demonstrating a calcified plaque at the level of the choroid. Fluorescein angiography and ICG videoangiography may demonstrate choroidal neovascularization, which may be amenable to treatment by laser photocoagulation.