我们于1989年9月遇到口腔唇颊部增生性肌炎1例,现报告如下。病历摘要男患,30岁。左口角受外伤后20余天发现在口角上部唇颊部有一硬结,无不适感。口腔颌面部检查:口角左上方有一0.8×0.6cm 大小肿物,凸起于粘膜表面,质硬,表面光滑,活动良好,与覆盖上皮无粘连,无触压痛。行肿物单纯切除术。病理检查病变组织表面覆盖复层鳞状上皮,在其下方横纹肌组织中见呈灶状分布的嗜硷性巨细胞,细胞呈圆形或多边形,胞浆丰富,嗜硷性,有 We encountered one case of proliferative myositis in the oral cavity and cheek in September 1989. The report is as follows. The medical record summary is male, 30 years old. The left mouth corner was found to have an induration in the upper lip and cheeks of the mouth more than 20 days after the injury, with no discomfort. Oral and maxillofacial examination: There was a 0.8×0.6 cm mass on the upper left side of the mouth, which was raised on the mucosal surface, hard and smooth, with good activity, no adhesion to the covered epithelium, and no contact with tenderness. A simple tumor resection was performed. Histopathological examination of lesions covered the stratified squamous epithelium, and in the underlying striated muscle tissue showed focal distribution of osmiophilic giant cells, cells were round or polygonal, abundant cytoplasm, osmolphilic, there are