Choroidal osteoma is a condition in which bone is abnormally found in the choroid. It is more commonly found in females than males. The bony lesions can expand or shrink in size spontaneously, sometimes in response to hormonal changes such as menarche or menopause. Secondary choroidal neovascularization and serous retinal detachments in the absence of choroidal neovascularization may develop. For unknown reasons, they can spontaneously decalcify and leave atrophic changes to the overlying retinal pigment epithelium.