title: Fibrous histiocytoma of the tarsus.
abstract: A 21-year-old white man had an asymptomatic eyelid mass that had slowly enlarged for one year. On clinical examination the lesion was well circumscribed; it appeared subconjunctivally but provoked no conjunctival inflammation, and had a consistency suggestive of cartilage. Microscopic examination showed it was matted and composed of elongated fibro-histiocytes and an evenly distributed population of xanthoma cells and Touton giant cells. The lesion was easily removed by local excision because of a pseudocapsule formed by remnants of the tarsus; there has been no recurrence during a 12-month follow-up.
mesh_terms: D000328:Adult; D003560:Cysts / Q000175:diagnosis; D003937:Diagnosis, Differential; D005141:Eyelid Diseases / Q000175:diagnosis; D005142:Eyelid Neoplasms / Q000175:diagnosis / Q000473:pathology; D005350:Fibroma / Q000175:diagnosis / Q000473:pathology; D018219:Histiocytoma, Benign Fibrous / Q000175:diagnosis / Q000473:pathology; D006801:Humans; D008297:Male; D008537:Meibomian Glands