A Rare Case of Crossed Non-fused Ectopic Kidney

Crossed and non-fused kidneys are an exceedingly rare congenital anomaly in which one or both kidneys cross the midline to the opposite side. At the same time, the ureters are inserted in their normal anatomical locations in the bladder. Although crossed ectopic kidneys are mostly asymptomatic and incidentally discovered during workup for other disorders, they are prone to urological complications such as urinary tract infections (UTIs). Here we present the case of a 12-year-old male with a history of recurrent UTIs and urinary retention who presented to the emergency department with recurrent UTIs and urinary retention and was eventually found to have an ectopic unfused left kidney in the right lumbar region on computed tomography (CT).