omentectomy; surgical removal or the excision of the upper part of the omentum.

The omentum is a sheet of fat that is covered by the peritoneum.

The greater omentum is attached to the bottom edge of the stomach, and hangs down in front of the intestines. Its other edge is attached to the transverse colon.

The lesser omentum is attached to the top edge of the stomach, and extends to the under surface of the liver.