Association of squamous cell carcinoma of the head and neck with cancer of the esophagus.
D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000150:complications* / Q000000981:diagnostic imaging; D004938:Esophageal Neoplasms / Q000150:complications* / Q000000981:diagnostic imaging / Q000532:radiotherapy; D005500:Follow-Up Studies; D006258:Head and Neck Neoplasms / Q000150:complications* / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000000981:diagnostic imaging / Q000532:radiotherapy; D011859:Radiography