Osteochondroma of the Zygomatic Arch: A Case Report and Review of the Literature.

An osteochondroma, when reported in the maxillofacial region, is a benign neoplasm that involves the skull base, maxillary sinus, zygomatic arch, or mandible. Most commonly, the osteochondroma occurs in the coronoid process and the condyle. One rare subtype of osteochondroma reported in the literature, termed Jacob disease, arises from the coronoid process and interferes with the zygomatic arch. This report describes a unique case of an isolated osteochondroma arising from the zygomatic arch and interfering with the coronoid process, which was treated through surgical excision by an intraoral approach. The literature search indicated that this is 1 among only 9 other reported cases since 1964 in which an osteochondroma arose primarily from the zygomatic arch.