[Mesectodermal leiomyoma of the ciliary body--clinical aspects, surgery and immunohistochemistry].

The clinical, surgical and light microscopical features of a mesectodermal leiomyoma of the ciliary body are presented. Slit-lamp examination of a 63-year old woman strongly suggested a malignant lesion of the ciliary body and the peripheral choroid. Following cryoretinopexy and argonlaser-photocoagulation, the tumor and the adjacent portion of the cornea, angle structures, iris, ciliary body, choroid and sclera were removed en bloc. The defect was covered by a corneosclerotransplant 14 mm in diameter. Histological examination revealed a well circumscribed tumor of the ciliary body, consisting of sheets of fusiform cells. Intracytoplasmatic filaments gave a positive reaction to an actin antibody (Actin HHF 35 MA 931), demonstrating the smooth muscle origin of the ciliary body tumor by immunocytochemical means.