Radiology Which of the following is the earliest sign of ulcerative colitis on double-contrast barium enema study – A Mucosal granularity B Loss of haustrations C 'Collar - button' ulcer D Lead pipe colon 💡 Explanation Which of the following is the earliest sign of ulcerative colitis on double-contrast barium enema study - ✓ Correct Answer: A. Mucosal granularity