Inflammatory Bowel Diseases in Renal Transplantat Recipients: A Case Series and Review of the Literature.

Inflammatory bowel diseases are autoimmune disorders affecting the gastrointestinal tract and producing a wide variety of extraintestinal manifestations. Kidneys are a rare target organ of their extraintestinal activity, but if affected, renal function could deteriorate to end-stage kidney disease, which is curable only by organ transplantation. Renal calculi are the most common pathological kidney manifestation in IBD patients, followed by tubulointerstitial nephritis, glomerulonephritis, and other kidney pathologies. The liver is the most commonly transplanted organ in IBD patients (primary sclerosing cholangitis and autoimmune hepatitis), and a scarcity of literature on kidney recipients is present to date regarding the incidence of renal insufficiency, kidney transplantations, post-transplant IBD course and further complications such as graft rejection or infections in this specific group of patients. De novo IBD is a paradoxical entity in the setting of rigorous post-transplant immunosuppression. In this case series, we present three patients who underwent kidney transplantation with a history of an IBD and one patient who developed de novo Crohn's disease after the deceased donor organ transplant was performed.