RT Journal Article SR Electronic T1 Biopsy-proven fungal pyelonephritis complicating delayed graft function in a renal transplant patient JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e252313 DO 10.1136/bcr-2022-252313 VO 16 IS 2 A1 Aaron Jesuthasan A1 Candice Roufosse A1 Arun Ramaswami YR 2023 UL http://casereports.bmj.com/content/16/2/e252313.abstract AB Delayed graft function (DGF) is a common phenomenon following renal transplantation, which can be due to several factors. A rare cause includes invasive fungal infections, which can often be a challenge to diagnose. Nonetheless, prompt identification of such infections particularly within transplant patients is essential as they can lead to severe downstream sequelae, including graft loss and even death. We describe here a challenging case of fungal pyelonephritis complicating and potentially leading to DGF and further dialysis dependence within a renal transplant patient. Notably, we highlight the importance and clinical utility of biopsy to confirm the diagnosis, as investigations may be largely normal otherwise. Furthermore, we emphasise that with early identification of these infections, effective antifungal treatment can be commenced in a timely fashion leading to better patient outcomes and good graft function.