Radiology G.I.T. 915c6be2 Windsock appearance on barium is seen in? A Duodenal perforation B Duodenal ulcer C Brunner gland hyperplasia D Internal duodenal diverticulum High-Yield Explanation Ans DWindsock appearanceQ is intraduodenal barium contrast- filled sac that is surrounded by a narrow lucent line seen in intraduodenal diverticulumQ.