After thorough clinical, radiological and histopathological examination, Maxillofacial Surgeon Dr. S. M. Balaji diagnosed it as fibrous dysplasia involving the entire left body, angle and ramus of the mandible. Also there was an impacted mandibular left 3rdmolar in the coronoid process of mandible. Under General Anesthesia, intraorally bony excess was removed from both buccal and lingual surface of mandible and impacted tooth was also removed in toto. Thus entire bony swelling was removed and patient feels very happy to have the entire procedure done without any scars on the face.