Abstract
Duplication of the colon is an exceedingly rare anomaly. Thirty cases of this deformity with variations and associated malformations have been reported. Bornstein1states that cystic saccular structures have been erroneously described as duplications of the colon. Van Zwalenburg2and Ravitch3,4suggest dividing the anomalies into two main groups: 1. Large diverticuli or cysts (the type seen more frequently). Such cysts lie within the mesentery, between its root and the normal bowel; their course is more or less parallel to the bowel. They are not accompanied by duplication of other structures. Complication (volvulus, ulceration, or perforation) is usually produced by the size of the diverticulum. 2. Duplication of the structures derived from the hindgut. Doubling of the bladder and urethra is invariably associated with colonic duplication of this type. Symptoms are rare, except when the anomaly is accompanied by such developmental errors as imperforate anus or agenesis
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