患者男性，7岁，主诉：右侧面部缓慢无痛性肿大4个月．临床所见：右侧嚼肌区膨胀，触诊质硬、无痛，开口度正常．下颌曲面断层片示：右下颌骨升支前份及下颌角呈不规则低密度影，边界清楚，为波浪状，病变区有不规则骨间隔．手术所见：病变波及下颌升支前份、解突、乙状切迹及 Patient Male, 7 years old, Chief Complaint: Slow, painless swelling of the right side of the face for 4 months. Clinical findings: Right chewing muscle area expansion, palpation of hard, painless, normal opening. Mandibular surface tomography showed: the right mandibular ascending anterior and mandibular angle was irregular low density, clear boundary, wavy, diseased area with irregular bone space. Surgical findings: lesions affecting the mandibular lumbar branch before, solution suddenly, sigmoid notch and