Fibrous histiocytoma. A, Lesion presenting in a patient as a right globe proptosis. B, T1-weighted MRI imaging shows a hypointense retrobulbar mass abutting the optic nerve; it enhances with contrast. C, Complete excision of mass. D, Pathologic analysis with hematoxylin-eosin (H&E) staining, which shows a storiform pattern. E, Vimentin staining.