A patient with bizarre parosteal osteochondromatous proliferation in the mandible

Bizarre parosteal osteochondromatous proliferation lesions in the head and neck region are very rare. Clinically, these lesions present as protrusions of bone, usually in the small bones of the hands and feet. This report is of a 9-year-old girl with a bizarre parosteal osteochondromatous proliferation lesion in the mandibular mental region, a site that has not been described previously. Based on the physical examination and X-ray analysis, mandibular osteoma was clinically diagnosed. The tumor was locally excised and pathologically diagnosed as bizarre parosteal osteochondromatous proliferation. Five months later, the lesion recurred in the same region and was again locally excised. Postoperative recovery was uneventful and there has been no recurrence since the second operation, more than 8 years ago.