Solitary fibrous tumor of the orbit.
PURPOSE: We studied a case of solitary fibrous tumor of the orbit in a 75-year-old man. METHODS: The patient had painless, slowly progressive proptosis of eight months' duration. He underwent magnetic resonance imaging, which showed a well-circumscribed retrobulbar mass. The tumor was excised. RESULTS: Examination of the tumor disclosed haphazardly arranged spindle cells alternating with collagenous, hypocellular areas in a richly vascular background without necrosis. Immunoperoxidase stains showed characteristic expression of CD34 and vimentin. CONCLUSION: Solitary fibrous tumor can infrequently involve the orbit and may recur locally and metastasize, necessitating long-term follow-up.
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