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In the left iliac fossa, a Meckel diverticulum was identified. Its tip was adherent to the retroperitoneum. A segment of terminal ileum had herniated through the loop formed by the diverticulum, retroperitoneum, and adjacent bowel. Subsequently, it had become incarcerated and obstructed, resulting in gross dilation of the proximal small bowel. The Meckel diverticulum itself had perforated at its base. The affected segment of ileum was resected with the perforated Meckel diverticulum. Histological analysis confirmed the diagnosis of Meckel diverticulum containing ectopic gastric mucosa. The peritoneal cavity was thoroughly irrigated. Finally, a temporary double-barrel ileostomy was made. The patient had a good and uneventful recovery.

Meckel diverticulum is the most common congenital gastrointestinal malformation; it is found in up to 2% of the population.¹It is the remnant of the vitellointestinal tract, which disappears in the fifth to sixth week of gestation. The diverticulum is classically located 2 ft (60 cm) from the ileocecal junction along the antimesenteric border and is 2 inches (5 cm)²long. One large retrospective study³found that 84% of diverticula were asymptomatic. Of the 16% that were symptomatic, the commonest presentations were diverticulitis, bleeding, and perforation.³It has also been reported that the Meckel diverticulum may present as a focus for intussusception or a volvulus, thus causing obstruction.³This particular case in which a Meckel diverticulum has caused obstruction and perforation as a result of internal herniation of the bowel through a loop formed by the diverticulum and the retroperitoneum is most unusual. To our knowledge, there are very few cases of this in the literature. We believe it to be only the second documented case of its kind in the adult population.⁴In this case, the pathological abnormality arose predominantly as a result of the adhesions created following this patient's appendicitis 4 years previously. It is important to remember that adhesive disease of the peritoneal cavity, following surgery, or inflammation may complicate the presentation of Meckel diverticula.

Correspondence:Chika Edward Uzoigwe, MRCS, Department of Surgery, Bradford Royal Infirmary, Bradford, Yorkshire, BD9 6RJ, England (chika@doctors.org.uk).

Accepted for Publication: April 19, 2006.

Author Contributions:Study concept and design: Uzoigwe, Bitra, Munot, Griffith, and Davies. Acquisition of data: Uzoigwe, Bitra, Munot, Griffith, and Davies. Analysis and interpretation of data: Uzoigwe, Bitra, Munot, Griffith, and Davies. Drafting of the manuscript: Uzoigwe, Bitra, and Munot. Critical revision of the manuscript for important intellectual content: Munot, Griffith, and Davies. Administrative, technical, and material support: Uzoigwe, Bitra, Munot, Griffith, and Davies. Study supervision: Munot, Griffith, and Davies.

Financial Disclosure:None reported.