Vesical calculus: an unusual complication of renal transplantation.

Vesical calculus formation in renal transplant patients is rare. We describe seven patients who developed calcium oxylate or combination calcium oxylate-magnesium ammonium phosphate stones on a polypropylene suture nidus at the site of a ureteroneocystostomy. The use of a nonabsorbable suture in the urinary tract should be avoided.