Omental cyst

Omental cysts are rare diseases, accounting for only about 5% of omental diseases, and their incidence is much lower than that of mesenteric cysts. The ratio of the two is about 1: 5. Omental cysts are located between the two layers of the omentum, and are divided into true cysts and pseudocysts. The former are mostly due to the abnormal development of congenital ectopic lymphoid tissue or lymphatic obstruction. The cyst wall is thin and covered with walls. Monolayer endothelial cells can be single- or multi-chambered, and the contents are mostly light yellow serous and chyle-like fluids, with cases of bleeding and infection. The sac fluid is bloody, grass-green, orange-red or brown, and the cyst wall is thick. Congestion, edema, and endometrial disappearance; the latter can be caused by inflammation, damage, and parasites. Its cyst wall is thick and consists of inflammatory cells and fibrous connective tissue. Unlined endothelial cells are mostly single rooms with turbidity. Inflammatory exudate or bloody.

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