Adenoma of nonpigmented ciliary epithelium with smooth muscle differentiation.

A 35-year-old man underwent successful iridocyclectomy for a ciliary body mass that was subluxating the lens and causing a secondary cataract. Histopathologically the mass proved to be a spindle cell tumor, but leiomyoma and melanoma were initially considered to be diagnostic possibilities. However, further studies and immunohistochemical studies revealed that the tumor probably arose from the nonpigmented ciliary epithelium. The spindle cells represented smooth muscle differentiation within the mass. The final diagnosis was adenoma of the nonpigmented ciliary epithelium with smooth muscle differentiation.