Large intraosseous arteriovenous malformations (AVM) of the mandible are rare lesions. A review of the American literature has revealed sixty cases involving the mandible. This article presents a case of left mandibular AVM in which the initial treatment was embolization. Eventually, however, an emergency hemimandibulectomy became necessary. Postoperative physiotherapy is considered an important part of the treatment in patients who have undergone hemimandibulectomy. An unusual feature in this case has been the amount of spontaneous regeneration of bone in the surgical site.