CT and MR Imaging Findings of a Granular Cell Tumor of the Orbit: Report of Two Cases

distinct, benign soft tissue tumor, characterized by large granular-appearing eosinophilic cells (1). Although originally thought to be a myogenic tumor, subsequent evidence has indicated that GCTs are most likely derived from Schwann cells from peripheral nerves (2, 3). Various sites can be affected by this tumor, with a 50% rate of occurrence in the head and neck region and the most common location in the tongue and subcutaneous tissue. On rare occasions, GCTs can arise in the orbit. To date only slightly more than 50 GCT cases of the orbit and periorbital region have been reported in the English literature (2, 4-6). We report the CT and MR imaging findings of two cases of orbital GCTs occurring in a 14-year-old boy and a 35-year-old woman.