Simultaneous Pancreas-Kidney Transplant Complicated by Kidney Allograft Torsion and Pseudoaneurysms of the Y-Allograft: A Case Report and Review of the Literature.

Background. We report and review the literature of two rare complications of simultaneous pancreas-kidney transplantation (SPKT) occurring in one patient. Case Report. A 39-year-old man with dialysis-dependent kidney failure secondary to type 1 diabetes mellitus underwent successful SPKT in October 2018. Three months later, he presented with an acute kidney injury (AKI) and returned to dialysis. Kidney scintigraphy showed a central photopenic region, and angiograms showed absent flow in the kidney transplant artery without treatable thrombus and the incidental finding of two pseudoaneurysms of the pancreatic Y-graft. He remained dialysis-dependent for three weeks before spontaneous partial recovery of allograft function; repeat kidney scintigraphy showed significant improvement in perfusion. However, in April 2019 he was readmitted with a sudden deterioration in kidney allograft function again necessitating haemodialysis. Repeat imaging confirmed that the kidney allograft had shifted from the left iliac fossa to the midline. He underwent surgical exploration, during which torsion of the kidney allograft was confirmed and a nephropexy was performed. The kidney allograft was originally implanted in the left retroperitoneum via a midline transperitoneal approach, which likely predisposed it to torsion. The pseudoaneurysms of the pancreatic Y-graft were managed conservatively, and surveillance imaging demonstrated that they remained stable in size. The patient regained reasonable kidney allograft function (estimated glomerular filtration rate, eGFR, of 45 mL/min) and maintained normal pancreatic allograft function. Conclusion. Kidney allograft torsion should be considered post-SPKT in patients with AKI and absent arterial flow. Although most case reports describe surgical management of pseudoaneurysms post-SPKT, our case demonstrates successful conservative management.