Sutural (wormian) bones are accessory bones which occur within the cranial sutures and fontanelles. Sutural bones of the cranial vault are formations associated with insufficient rate of suture closure and regarded as epigenetic and hypostatic traits. The Pterion is the H shaped suture present at the junction between Frontal, Parietal, Greater wing of sphenoid and Temporal bone at lateral side of skull. We are reporting a case of unusual large sutural bone at left side of the pterion region in an adult skull. Knowledge of this variation is very important for, radiologists, orthopedic surgeons, neurosurgeons and anthropologists.