Right paraduodenal hernia caused by a long vessel-like peritoneal band: a rare anatomical variation in a young adult

Paraduodenal hernias are rare congenital internal hernias, with right-sided cases being particularly uncommon and often difficult to diagnose due to nonspecific symptoms. We report a 21-year-old male with a 1-year history of recurrent abdominal pain and vomiting, previously managed conservatively. Physical examination and laboratory findings were unremarkable. Computed tomography demonstrated clustered small bowel loops in the right hemiabdomen with displacement of the superior mesenteric vessels, suggestive of an internal hernia. Laparoscopy confirmed a right paraduodenal hernia caused by a congenital mesenteric defect, which was successfully repaired laparoscopically, with prophylactic appendectomy performed. The patient had an uneventful recovery. This case highlights the importance of considering internal hernias in young patients with recurrent, unexplained abdominal symptoms and the role of early imaging and surgical intervention in preventing complications.