07.When the entire epithelium is dysplastic and no normal epithelial cells are left, then the process is beyond dysplasia and is now neoplasia. If the basement membrane is still intact, as shown here, then the process is called "carcinoma in situ" because the carcinoma is still confined to the epithelium.

07.当全层上皮细胞都发育不良，此过程就超出其范围而形成肿瘤。如图所示，基底膜尚完整时，由于癌细胞局限在上皮内，此情况称“原位癌”。