Secret operation on US president.
D005197:Famous Persons; D006076:Government; D049672:History, 19th Century; D006801:Humans; D008297:Male; D008441:Maxillary Neoplasms / Q000266:history / Q000601:surgery*; D008875:Middle Aged; D012509:Sarcoma / Q000266:history / Q000601:surgery*; D013515:Surgery, Oral / Q000266:history; D014481:United States