They are usually found near the optic nerve and can cause vision loss.
Osteomas tend to be relatively flat, lightly pigmented with well defined and scalloped edges.
Clumps of black or brown pigment can be seen on its surface. Periodic observation of patients with choroidal osteoma is warranted. Once it is inside the osteoma, it also has trouble getting out. This is why the fluorescein pattern of choroidal osteoma is one of slow uptake and late or persistent fluorescence. Link to see a fluorescein angiogram.