[Congenital intrathoracic right kidney].

Ectopic intrathoracic kidney is an extremely rare congenital disorder. It is generally asymptomatic, being discovered as incidental finding on a routine chest radiograph. Diagnosis is established by an intravenous pyelogram demonstrating an abnormally shaped excretory system with longer than usual ureters, which also helps to differentiate it from other posterior mediastinal tumors, such as neurogenic masses, including neuroblastoma, ganglioneuroma, neurofibroma, neuroenteric cysts, meningoceles and hernia of the foramen of Bochdalek.