RETINAL AND CHOROIDAL TUMORS
Choroidal nevus is a benign tumour, which presents itself as a flat, dark gray-brownish pigmented lesion, occurring more commonly in the post-equatorial region, often with overlying drusen and a yellowish ring around the base (halo nevus). It has a slightly well demarcated margin which size is mostly not greater than a disc diameter.
Multiple nevi may occur in patients with neurofibromatosis.
The nevus can grow during puberty, but in adults the growth should be watched. The chance of a nevus converting into a melanoma is extremely low (1/20,000). Features such as subretinal fluid or overlying orange pigment imply an active mass and could be an early sign of a malignant transformation of the lesion.
Choroidal neovascularization membrane associated with exudation or hemorrhage may...