Rectal duplications in children: two case reports and review of the literature

Duplications of the rectum are extremely rare, with only 60 cases reported in the world literature. We report two patients with cystic duplications of the rectum who underwent surgical intervention in our institution during the past 10 years. A 5-year-old white male presented with constipation and tenesmus as well as a 4-cm cystic mass that protruded from the anus when he strained to pass stool. Rectal examination and ultrasound suggested the clinical diagnosis of rectal duplication. Transanal submucosal resection of a 3-cm cystic mass adherent to the posterior rectal wall was carried out. Histologic examination revealed a rectal duplication containing zones of ciliated respiratory epithelium. The second patient, a 6-year-old white female, presented with a history of chronic constipation. A large, cystic presacral mass was detected by rectal examination and confirmed by CT scan. Complete submucosal resection of the cystic duplication was performed through a posterior trans-sacral approach. Histology revealed a rectal duplication lined by respiratory epithelium. Although duplications are generally lined by mucosa of the adjacent bowel, heterotopic mucosa, most commonly gastric or pancreatic, may be present. Rectal duplications with ectopic gastric mucosa have been previously described, but to our knowledge the presence of respiratory epithelium in a rectal duplication has never been reported. Complete resection of these lesions results in cure.Presented at the 21st Annual Meeting Canadian Association of Paediatric Surgeons Edmonton, Alberta, Canada September 21–23, 1989 Offprint requests to: A. L. Bensousson