Lesser Sac Inferior Recess

recessus inferior sacci minoris

The inferior recess of the lesser sac extends between the layers of the greater omentum toward the transverse colon, forming the inferior boundary of the omental bursa. It may accumulate fluid in lower pancreatic pseudocyst and mesenteric haematoma.

Anatomical Data

Boundaries & Contents

Location	Lower extension of the lesser sac, between the layers of the greater omentum below the stomach
Boundaries	Front and back layers of the greater omentum Greater curvature of the stomach (above) Transverse colon and mesocolon (lower limit in most adults, as the omental layers fuse)
Contents	Small amount of peritoneal fluid

Biomechanics

Function & Actions

Largely sealed off in adults by fusion of the omental layers, but in some people it stays open and fluid or pus from the lesser sac can track down into it.

Clinical Relevance

Clinical Notes

The inferior lesser sac recess is the pathway for lesser sac collections to extend toward the pelvis in severe pancreatitis. Pancreatic walled-off necrosis may extend into this inferior recess producing a collection between the omental layers that is distinct from the main body of the lesser sac. Endoscopic transgastric drainage may not reach this inferior extension, requiring separate percutaneous access.

Pathology

Common Injuries & Conditions

Inferior Lesser Sac Pseudocyst Extension

Pancreatic pseudocyst extending into the inferior lesser sac recess between omental layers producing an inferior epigastric collection that may require separate drainage from the main body pseudocyst.

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