原发于上颌窦的平滑肌肉瘤较为少见。现报告1例: 男,50岁。一年前无明显诱因自觉右面颊部麻木感及肿胀,右上牙槽疼痛,近一个月来伴右面颊部疼痛,于1986年1月6日入院。外院病理检查报告为“平滑肌肉瘤”。自患病以来双鼻通气良好,无脓血性分泌物,张口不受限,视力正常。 体检;右面颊部肿胀,质硬,有弹性,触癌明显。右眼球稍向外上方移位,眶下壁饱满,下鼻道前方有一红色凸起,表面覆以粘膜。X线克瓦氏位片、上颌窦断层、颅骨侧位片均提示右上颌窦腔扩大,密度 LPS in the maxillary sinus is relatively rare. Now report a case: male, 50 years old. A year ago, no obvious incentive to consciously right cheek numbness and swelling, upper right alveolar pain, nearly a month with right cheek pain, January 6, 1986 admission. External hospital pathology report as “leiomyosarcoma.” Since the illness since the double nasal ventilation, no purulent discharge, mouth is not limited, normal vision. Physical examination; right cheek swelling, hard, flexible, clear cancer. The right eye slightly upward displacement of the upper, full orbital wall, the lower nasal front has a red bulge, the surface covered with mucosa. X-ray KV films, maxillary sinus, skull lateral films were prompted to expand the right maxillary sinus cavity density