Radiology Which of the following is not a diagnostic feature of gallstone ileus on a plain abdominal radiograph? A Ectopic calcified gallstone B Stone < 2.5 cm size in the intestine C Signs of small intestinal obstruction D Gas in the biliary tree 💡 Explanation Which of the following is not a diagnostic feature of gallstone ileus on a plain abdominal radiograph? ✓ Correct Answer: B. Stone < 2.5 cm size in the intestine