动脉瘤样骨囊肿发生于上颌窦者极少见，我科收治1例。报告如下。患者，女，48岁。因右侧面部渐进性膨隆伴鼻出血，头痛4个月，于1997年3月3日以上颌窦肿瘤收治入院。体检：一般情况尚可，心、肺、肝未见异常。右侧面颊部弥漫性膨隆，质硬，无压痛，肤色正常。右鼻腔外侧壁内移? Aneurysmal bone cyst occurred in the maxillary sinus were rare, our department admitted 1 case. The report is as follows. Patient, female, 48 years old. Due to the gradual swelling of the right side of the nose with bleeding, headache for 4 months, on March 3, 1997 admitted to the maxillary sinus tumors. Physical examination: the general situation is acceptable, heart, lung, liver no exception. Right cheek diffuse bulging, hard, no tenderness, normal skin color. Right nasal lateral wall shift?