You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is An 85-year-old man is brought to the hospital with a 2-day history of nausea and vomiting. He has not passed gas or moved his bowels for the last 5 days. Abdominal films show dilated small bowel, no air in the rectum and air in the biliary tree. Which of the following statements is TRUE? and explain in detail?
Gallstone ileus usually results from formation of a cholecystoenteric fistula and is seen more often in elderly patients. Obstruction occurs most often at the terminal ileum. Treatment is laparotomy and removal of the stone through an enterotomy proximal to the obstruction; cholecystectomy should be done if the patient can tolerate the additional surgery.