title: Disciform lesion overlying melanocytoma simulating progression of choroidal melanoma.
abstract: A 49-year-old white patient presented with a small pigmented lesion nasal to the disc. The clinical appearance of the area in question was noted to change over a four year period and simulated a progressively enlarging choroidal melanoma. On enucleation, the lesion was histopathologically proved to be a melanocytoma located nasal to the optic nerve head. It caused--or was at least associated with--an overlying disciform hemorrhagic and transudative response secondary to a neovascular ingrowth through Bruch's membrane. Thus, a melanocytoma must now be considered another of the possible causes of a disciform-shaped fundus lesion.
mesh_terms: D002829:Choroid / Q000473:pathology; D002830:Choroid Neoplasms / Q000175:diagnosis* / Q000473:pathology; D003951:Diagnostic Errors; D005260:Female; D005654:Fundus Oculi; D006470:Hemorrhage / Q000473:pathology; D006801:Humans; D008545:Melanoma / Q000175:diagnosis*; D008875:Middle Aged; D009508:Nevus, Pigmented / Q000175:diagnosis* / Q000473:pathology; D012163:Retinal Detachment / Q000473:pathology; D013997:Time Factors