病人男性,65岁,主诉在左上颌磨牙区固定桥下长一无痛性溃疡。该固定桥以第二双尖牙及第三磨牙为桥基牙。损害为一大小约2.5×2厘米,横跨牙槽嵴的浅溃疡,呈白色绒毛状糜烂面,其中央剥脱处无疼痛及出血现象。局部X线检查,显示其下之骨未受累,未为溃疡浸蚀。于溃疡边缘取活检。组织学检查为未分化转移癌。 The patient male, 65 years old, complained of a painless ulcer under the fixed bridge in the maxillary molar area. The fixed bridge uses the second bicuspid and the third molar as bridge abutments. The lesion was a shallow ulcer of about 2.5 x 2 cm across the alveolar ridge, showing a white villous erosion surface with no pain and bleeding at its central exfoliation. Local X-ray examination showed that the underlying bone was not affected and was not ulcerated. Take a biopsy at the edge of the ulcer. Histological examination was undifferentiated metastatic cancer.