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 woman hasa 48-hour history of generalized abdominal pain and vomiting. On examination, she is dehydrated multiple dilated small bowel loops measuring up to 4 cm in diameter. A linear gas-filled structure is present in the right upper quadrant with short branches extending from it. What is the most likely diagnosis? and explain in detail?
Ans CSmall bowel obstruction in an elderly patient with evidence of pneumobilia is suggestive of Gall stone ileusQ. Imaging features of gall stone ileus are: Pneumobilia which appears as central branching air lucencies in the liver, small bowel obstruction and radiopaque density in the abdomen (most common site of impaction is the terminal ileum).