title: The surgeon opts to operate: why?
mesh_terms: D000328:Adult; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D003093:Colitis, Ulcerative / Q000188:drug therapy / Q000601:surgery* / Q000628:therapy; D006801:Humans; D008297:Male; D008532:Megacolon, Toxic / Q000188:drug therapy / Q000601:surgery; D010288:Parenteral Nutrition
chemical_list: D000900:Anti-Bacterial Agents