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原位癌也称上皮内癌或表浅、浸润前、零期癌,是指一种具有真性肿瘤的一切特征但并不浸润或转移的恶性上皮瘤。它是由形态、大小和核特征或核与胞浆比例均不典型的一些细胞组成,可有不典型的核分裂。病变仅侵及粘膜上皮,不侵犯或超越基底膜。除在上皮表面外,可向下侵及粘液腺导管。原位癌究属一种不典型增生,抑或癌前期阶段或就是浸润癌,至今并不清楚。作
In situ cancer, also known as intraepithelial neoplasia or superficial, preinvasive, and zero-phase cancer, refers to a malignant epithelioma that has all the features of a true tumor but does not infiltrate or metastasize. It is composed of some cells that are not typical in morphology, size and nuclear characteristics or in the ratio of nuclear to cytoplasm, and may have atypical nuclear division. The lesion only invades the mucosal epithelium and does not invade or exceed the basement membrane. In addition to the epithelial surface, it can invade the mucous gland duct. In situ cancer is a type of atypical hyperplasia, or precancerous or invasive cancer. It is still not clear. Make