Case Report: A rare case of spontaneous lesser omental sac hernia with pneumomediastinum.

Authors

Jianlei Yang, Zili Zhang

Published in

Frontiers in surgery. Volume 13. Pages 1900310. Epub Oct 13, 2026.

Abstract

Pneumomediastinum typically results from trauma, iatrogenic injury, or an acute rise in intrathoracic pressure, as occurs with forceful coughing or vomiting. Here, we report an adolescent male patient with a congenital lesser omental defect, which led to small bowel herniation into the lesser sac. The incarcerated intestinal loop compressed the pylorus, resulting in gastric outlet obstruction, intractable vomiting, and subsequent pneumomediastinum. This case illustrates lesser sac herniation leading to vomiting-induced pneumomediastinum via the "Macklin effect".

PMID:
42947703
Bibliographic data and abstract were imported from PubMed on 28 Oct 2026.

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