Case report. An unusual thoracic mass.

Intrathoracic renal ectopia is a rare congenital abnormality that is often discovered incidentally. Plain radiography of the chest is often indeterminate, particularly in cases where there may be more than one pathology. CT is the mainstay of diagnosis in such cases where malignant or benign features may be identified and, as in this case report, it can confirm confidently the diagnosis of a rare benign mass and negate the need for further investigation. Here, the clinical and radiological findings of intrathoracic kidneys are discussed, together with a review of the literature.