A posteriorly perforating ulcer in the pyloric antrum of the stomach is most likely to produce initial localized peritonitis or abscess formation in the following:
Answer is A (Omentum bursa) "Gastric ulcers perforate into the lesser sac, which can be paicularly difficult to diagnose" - Bailey "A gastric ulcer perforates into the lesser sac, then no signs of generalised peritonitis can be seen but misleading symptoms may appear" - Schwaz As can be seen from the figure, a posteriorly perforating ulcer of the stomach will localize in the lesser sac or omental bursa only. (lesser sacis synonymous with omental bursa)
Omental bursa (lesser sac)
Greater sac
Right subphrenic space
Hepato renal space (pouch of Morison)