Duplications may occur in any portion of the alimentary tract from the base of the tongue to the anus. These may be elongated, tubular structures duplicating large or small portions of the alimentary canal. They are seen also as cystic structures intimately attached to the alimentary system. Finally, they may take the form of giant diverticula with free connection to some part of the bowel. However, the inclusive term "duplication of the alimentary tract" is applied to all these anomalies. Furthermore, a true duplication must contain a coat of smooth muscle, connect with some portion of the alimentary canal, and be lined with alimentary tract mucous membrane.1 This condition should not be confused with Meckel's diverticulum, which is an entirely different entity with a distinct embryonic derivation.
The relatively small number of duplications reported in the literature would suggest that this represents an uncommon condition.2 Duplications are seen
Stockman JM, Young VT, Jenkins AL. DUPLICATION OF THE RECTUM CONTAINING GASTRIC MUCOSA. JAMA. 1960;173(11):1223-1225. doi:10.1001/jama.1960.73020290004010a