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Background: Transplant ureter obstruction is an important cause of graft loss after kidney transplantation. Most cases occur early after transplantation and are related to surgical causes or ischaemic strictures. Underlying mechanisms of late ureteral obstruction are less well understood.Case report: We present the case of a 61-year-old man who showed gradual decline in renal allograft function and hydronephrosis nine years after transplantation, due to an inguinal herniation of the transplant ureter. After urinary diversion using a percutaneous nephrostomy, graft function restored and the patient underwent surgery. The ureter was reduced from the inguinal hernia and re-implanted in the bladder, with primary closure of the abdominal wall defect. Postoperative course was uneventful and serum creatinine returned to baseline levels.Discussion: Search of relevant literature revealed a number of similar cases, which allowed identification of risk factors associated to the development of uretero-inguinal herniation leading to obstructive nephropathy. Diagnosis of this rare cause of transplant dysfunction and operative treatment strategies are discussed.Conclusions: Inguinal herniation of the transplant ureter leading to ureteral obstruction is a rare, probably underreported, cause graft of dysfunction. Therefore, we advocate elective repair of inguinal or incisional hernias in renal transplant recipients.