Retrobulbar granular cell myoblastoma.
D000293:Adolescent; D005094:Exophthalmos / Q000209:etiology; D006801:Humans; D008297:Male; D009379:Neoplasms, Muscle Tissue / Q000473:pathology / Q000601:surgery; D009900:Optic Nerve; D009918:Orbital Neoplasms / Q000473:pathology / Q000601:surgery