[Cancer of the colon following ureterosigmoidostomy or following bladder enlargement using a colonic graft].

The role of carcinogenic factors following urinary diversion are here studied on the basis of three very different cases. In the first, an adenocarcinoma developed at the site of a ureterocolic anastomosis thirty one years after Coffey's operation for bladder exstrophy. In the second, the tumor had developed, 31 years after uretero-sigmoidostomy, for ureteral trauma. The anastomosis had moreover ceased to function ten years previously. In the third case, the patient had undergone a right nephrectomy for urinary tuberculosis and a colocystoplasty to enlarge the bladder with re-implantation of the left ureter in the graft. Twenty one years later, an adenocarcinoma developed at the site of the anastomosis between the colonic graft and the bladder. This was an exceptional case (possibly the first) of a cryptal tumor developing out of contact with material. It thus runs counter to the alleged role of facies in the development of adenocarcinomas following urinary diversion.