Carcinoma of the colon arising at ureteral implant sites despite early external diversion: Pathogenetic and clinical implications

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Abstract
Colon carcinomas develop at the site of implantation in approximately 6% of patients who undergo ureterosigmoidostomy for benign conditions. Generally, the obstruction of a long-functioning uretero-sigmoidostomy heralds the presentation of the malignancy. The development of a carcinoma of the colon at the site of the ureteral stump 22 years after conversion to ileal conduit in a ureterosigmoidostomy, which had been in place for only nine months, raises fundamental questions about the pathogenesis of the tumor. The long-assumed role of urine in the induction of these iatrogenic tumors must be questioned. This issue and suggestions for management and prevention are discussed.

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