Abstract
Experimental resection of a segment of ureter in the puppy with end-to-end ureteroureterostomy led to severe anastomotic stricture, obstructive atrophy, and 100% ipsilateral renal loss at one year. This may have been the result of unrecognized anastomotic tension. Transureteroureterostomy was followed by normally functioning upper urinary tracts at the end of one year, without evidence of damage to the recipient ureter. These experimental findings in the growing animal suggest that transuretero-ureterostomy in the immature nondilated ureter is a safe and reliable procedure in the management of surgically acquired unilateral segmental ureteral defects.
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