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A case of congenital obstructed Treitz9s hernia presenting with bilious vomiting in a newborn baby girl has been presented. Internal herniation of contents within a peritoneal sac of the right paramesocolic hernia formed abdominal cocoon which simulated volvulus neonatorum. Plain radiographs and contrast studies were helpful in defining the nature and extent of the lesion. The patient underwent exploratory laparotomy, reduction of small bowel contents from the hernial sac forming an abdominal cocoon, Ladd9s procedure to correct associated midgut malrotation with incidental appendicectomy uneventfully and recovered well.

Treitz's hernia is the eponymous name for a paraduodenal hernia. These are rare hernias that arise in the potential spaces and folds of the posterior parietal peritoneum adjacent to the ligament of Treitz. Presentation may be acute with small bowel obstruction or bowel ischaemia, or with chronic intermittent abdominal pain. Treatment is by surgery, due to the high (50%) lifetime risk of obstruction. Here, we present two cases from our own institution and review the literature regarding the embryology, anatomy, cross-sectional imaging and surgery of these fascinating hernias.