Ectopic intrathoracic kidney is rare and usually causes no symptoms. It is most often discovered as aposterior mediastinal or juxtadiaphragmatic mass by chest radiography. Intravenous pyelogarm or sonography allowdifferentiation from significant lesions, thus avoiding surgery or biopsy. We have experienced a case of ectopicintrathoracic kidney, that was diagnosed by sonography, intravenous pyelogram. DMSA scan, and aortogram.