<prompt> Posterior perforation of peptic ulcer drain intoGreater sacParacolic gutterOmental bursaForamen of Winslow  <response>: Posterior perforation of a gastric ulcer is a rare condition. ... However, 5-8 of ulcers lie in the posteriorwall of the body of the stomach . When posterior gastric ulcerperforates, it usually penetrates into the lesser sac behind the stomach which is a omental bursa Ref ganongs review of medical physiology 25e p654 