Synostosis of First Costomanubrial Joint.

The rare congenital anomaly of ribs was found incidentally during routine osteology classes. This type of abnormality of first rib May leads to compression of Neurovascular bundle and causes thoracic outlet syndrome. We are reporting a case of Synostosis of first rib, which we come across during osteology classes at Department of Anatomy, KBNIMS, Gulbarga, Karnataka, India. The specimen showed fusion of first rib with sternum on both sides which is very rare. As far as the literature referred there was no such kind of anomaly reported. Knowledge of such anomalies is an important to know, especially for surgeons and radiologists for interpretation.