[A rare cause of exophthalmia: intraorbital cavernous hemangioma (about a case)].

Cavernous hemangioma is the most frequent primary benign vascular tumor of the orbit in the adult; the median age of diagnosis is 42 years with a female predominance. This tumor develops slowly and has no tendency for spontaneous regression; it is electively located at the level of the retro-ocular muscular cone but it can develop in the extraconic space. Clinically it appears as progressive irreducible, non-pulsating, painless (unless there's an unexpected complication) exophthalmia, associated with decrease in visual acuity in 2/3 of cases. The diagnosis is easily confirmed by imaging, which allows to precisely locate the tumor in relation to the optic nerve and the oculomotor muscles and to indicate the type of surgical approach. Surgical resection should be complete; it is usually simple because the tumor is limited and perfectly cleavable. Surgical approach is established on the basis of tumor volume and above all of the seat of the lesion. Functional prognosis is good and recurrences are rare. We here report the case of a 44-year old patient with orbital cavernous hemangioma revealed by exophthalmia.