Orbital granulocytic sarcoma in an elderly patient.

Purpose: To report a 71-year-old woman with acute myelogenous leukemia in remission who developed orbital granulocytic sarcoma.
Methods: The patient was referred for acute proptosis and decreased vision of the right eye. Computed tomography of the orbits demonstrated a right extraconal mass compressing the optic nerve. A right lateral orbitotomy was performed, and a portion of the mass was excised for diagnostic purposes and orbital decompression.
Results: Histopathologic and immunohistochemical evaluation disclosed orbital granulocytic sarcoma. With chemotherapy and radiation, vision remained stable and right proptosis resolved.
Conclusions: Orbital granulocytic sarcoma is usually diagnosed in children with a history of acute myelogenous leukemia. This case demonstrated that this entity may also occur rarely in older patients with a history of acute myelogenous leukemia.