动脉瘤性骨囊肿是骨组织少见的非真性肿瘤的良性病变,以四肢长管骨及脊椎为好发部位,发生于颌骨者更为少见。笔者于近二年收治2例,随访观察1年以上,现报告如下。例一,患儿男,6岁。1年前他人发现右耳垂前部渐进性肿大,无症状,未作治疗。否认外伤史。查体:面部不对称,右耳前下部软组织明显肿大,肤色正常,右下颌角处可触及5×6×6cm肿块,硬、固定、无压痛,局部无杂音及震颤,穿刺液为血性液体,口 Aneurysmal bone cysts are rare benign bone lesions of benign lesions to the long limbs and spine as a predilection site occurred in the jaw were more rare. The author admitted in the past two years 2 cases, followed up for more than 1 year, are as follows. Example 1, male child, 6 years old. One year ago others found that the right ear lobes progressively swollen, asymptomatic, untreated. Denied the history of trauma. Examination: facial asymmetry, the right lower ear soft tissue before the lower part of the obvious enlargement, normal skin color, right mandibular angle can reach 5 × 6 × 6cm mass, hard, fixed, no tenderness, no local noise and tremor, puncture fluid is bloody fluid ,mouth