Malignant fibrous histiocytoma of the orbit.

A recent review of orbital tumors at the Armed Forces Institute of Pathology has shown that fibrous histiocytoma is the most common primary mesenchymal tumor of the orbit in adults. This surprising statistic is explained by the fact that the histologic classification of mesenchymal neoplasms has been revised extensively during the last two decades to include previously distinct tumors of fibrous tissue under the common histopathologic diagnosis of fibrous histiocytoma. We present the computed tomographic findings of a primary malignant fibrous histiocytoma of the orbit, along with a review of the literature.