Prune-Belly Syndrome (Triad Syndrome) (Triad Syndrome) By Ronald Rabinowitz, MD, University of Rochester Medical Center; Jimena Cubillos, MD, University of Rochester School of Medicine and Dentistry Reviewed / Revised Aug 2022 | Modified Sep 2022 View Patient Education Topic Resources Prune-Belly Syndrome Prune-belly syndrome consists of abdominal muscle deficiency, urinary tract abnormalities, and intra-abdominal undescended testes.