Extraskeletal Ewing's sarcoma occurring as a mass in the neck.
D000293:Adolescent; D006258:Head and Neck Neoplasms / Q000175:diagnosis* / Q000628:therapy; D006801:Humans; D008297:Male; D009132:Muscles; D009334:Neck Muscles; D012512:Sarcoma, Ewing / Q000175:diagnosis* / Q000628:therapy