Solitary fibrous tumor of the orbit.

Solitary fibrous tumor (SFT) is a mesenchymal neoplasm that most frequently arises in the pleura and uncommonly involves the orbit. We report the clinical and pathological features of an orbital SFT in a 50-year-old woman. The patient presented with an 8-year history of painless, slow-growing, visible mass in the right caruncle. Computed tomography showed a well-circumscribed, homogenous, soft tissue mass in the inferomedial aspect of the orbit. The tumor was totally excised via anterior orbitotomy. Histopathologic and immunohistochemical evaluation identified the mass as an SFT. The patient was free of tumor recurrence at 1-year follow-up. Orbital SFT can present as a visible mass in the caruncle and may recur if not excised completely. Long-term follow-up of patients is necessary because SFT may recur many years after operation.