Abstract
Background: The solitary fibrous tumor (SFT) is a spindle-cell tumor that very rarely involves the orbit. We report a case that we compare to reports in the literature. Case: A 43 year old man presented a conjunctival inflammation of the left eye developing over 14 months with progressive proptosis. Magnetic resonance imaging revealed a retroocular mass, which showed isointensity on T1 and hyperintensity on T2. Histological examination of the lesion confirmed the diagnosis of the SFT of the orbit. The patient was doing well without recurrence after 12 months. Discussion: The diagnosis of SFT is histological. It is a mesenchymal tumor. Immunohistochemically , the tumor cells are strongly positive for CD34 and vimentin. Conclusion: The SFT of the orbit is a very rare and generally benign tumor. immunohisochemically differentiated from other spindle-cell tumors of the orbit . The treatment is a complete surgical excision, and long-term follow-up is necessary because recurrence may appear long after treatment.
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