Although supravesical hernias were described as early as 1804, there have been fewer than 100 cases reported in the literature. The supravesical fossa is a triangular area bounded laterally and above by median and medial umbilical ligaments, and below by the peritoneal reflection that passes from the anterior abdominal wall to the dome of the bladder. A hernia starting in this fossa usually protrudes through the abdominal wall as a direct inguinal hernia (external supravesical hernia). Less commonly, it remains within the abdomen, passing into spaces around the bladder (internal supravesical hernia). A 43-year-old mill worker presented with an enlarged painful mass in the left groin. He underwent a surgical repair of a direct inguinal hernia without addressing an unrecognized supravesicular component. Eight hours after his discharge next morning, he presented with acute abdomen, nausea, vomiting, and abdominal distention. The second surgery revealed the presence of a left lateral internal supravesical hernia with incarcerated small bowel. This was also repaired, and the patient was discharged in stable condition. This report aims to review and discuss the surgical anatomy of these rare supravesical hernias and calls attention to this type of hernia as an unusual cause of small bowel obstruction.

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