A case report of non-functional ectopic left kidney obstructing the right kidney in crossed fused kidneys: A rare entity

•Crossed renal fused ectopy is rare and asymptomatic congenital condition. Association to other malformations is possible.•The ectopic kidney may be responsible of the obstruction and the mal function of the orthotopic kidney.•This is the first case to be reported in literature.•Surgery might be difficult due to aberrant vascularization and possible malrotation of the kidney.