We present a case of a 22-year old male, who was admitted to the Pneumonology Department due to an abnormal chest X-Ray, as an incidental finding on routine examination. The patient was asymptomatic, without any abnormal findings on physical examination. The CT of the chest revealed the presence of an intrathoracic rib in the right hemithorax. The intrathoracic rib is a very rare congenital anomaly. About 40 cases have been reported in the literature and only in a few of them a CT of the chest has been performed. The need fοr diagnosis of this congenital anomaly lies on the recognition of its benign nature and the exclusion of other pathologic disorders. Pneumon 2006; 19(4):393-395.