全舌背粘膜良性过角化病局部恶变１例大庆石油管理局职工医院口腔科（１６３００１）何成君舌背粘膜良性过角化病少见，发生全舌背者更少见。我科曾遇１例，而且局部发生恶变，报告如下。患者，女，４５岁。２０年前舌背即出现牛奶样斑块，无痛，不可去除，且呈渐进性加重... Whole tongue back benign mucosa benign keratosis Local malignant transformation of a case of Daqing Petroleum Administration Hospital of Stomatology (163001) He Chengjun tongue hyperkeratosis benign hyperkeratosis, the occurrence of the whole tongue is more rare. Our department had a case, and local malignant transformation, the report is as follows. Patient, female, 45 years old. Twenty years ago, there was a milk-like plaque on the tongue, painless, irreversible, and gradual increase ...