Intraosseous arteriovenous malformations (AVMs) in the head and neck region are uncommon. There are several types and they can have a wide range of clinical presentations. Depending on the blood flow through the AVM, the treatment may be challenging for the attending team and may lead to life-threatening hemorrhages. A clinical case report is presented. A 9-year-old girl, seen for gingival bleeding during oral hygiene, was found to have a high-flow AVM located within and around the mandible. Two-stage treatment consisted of intra-arterial embolization followed by intraoral injection of a sclerosing agent 8 weeks later. At the 8-year follow-up, imaging study showed no evidence of recurrent lesion inside or outside the bone. The final outcome is a correct occlusion with a symmetric facial result. This case shows that conservative treatment may be the first treatment option mostly in children. Arteriography and transcortical injection were enough to control the AVM.