Omental bursa -the omental bursa (lesser sac) is the remnant of the right coelomic cavity, which, owing to rotation of the gut and differential growth of the liver, lies behind the stomach. a posterior gastric perforation or an inflamed pancreas could lead to abscess formation in the lesser sac. the right subhepatic space might become secondarily involved via communication through the omental foramen (of winslow). the pouch of morison, which is the combined right subhepatic and the hepatorenal spaces, may be the seat of abscess formation related to gallbladder disease or perforation of a duodenal ulcer. the right subphrenic space is between the liver and the diaphragm and communicates with the pouch of morison. all these spaces are in communication with the greater sac of the peritoneal cavity.
