又称异形增生或称核结构不良等。它可见于任何组织或细胞,其主要形态学表现为细胞核相对增大,核膜增厚,染色质增多,核形不规则,核浆比例增大,但不具备恶性肿瘤的形态特点等。它属于癌前病变的一种,在某种因素继续作用下,它可以由量变质变,转变为恶性肿瘤。如果某些因素去掉,它又可能恢复到正常状态。有人称不典型增生是一种不稳定状态。但晚近许多学者认为,不典型增生可有两种类型,即炎性不典型增生与瘤性不典型增生。前者DNA分析通常为二倍体,一般不发生恶性转化。后者DNA分析常为增殖 Also known as dysplasia or bad nuclear structure. It can be seen in any tissue or cell, the main morphological manifestations of the relative increase of nuclear, thickening of the nuclear membrane, increased chromatin, nuclear irregular, increased proportion of nuclear plasma, but do not have the morphological features of malignant tumors. It belongs to a kind of precancerous lesions, under the influence of certain factors, it can change from quantitative metamorphosis, into a malignant tumor. If certain factors are removed, it may return to normal. Some people say that atypical hyperplasia is an unstable state. However, many scholars recently believe that atypical hyperplasia can have two types, namely, atypical hyperplasia and atypical hyperplasia. The former DNA analysis is usually diploid, the general does not occur malignant transformation. The latter often DNA analysis of proliferation