<unk>  is, by definition, a localized phenomenon, with no potential for metastasis unless it progresses into cancer. Therefore, its removal eliminates the risk of subsequent progression into a life-threatening condition. Some forms of<unk>  (e.g., colon polyps and polypoid tumours of the bladder) can be removed using an endoscope, without conventional surgical resection. Dysplasia of the uterine cervix is removed by excision (cutting it out) or by burning with a laser. Bowen's disease of the skin is removed by excision. Other forms require major surgery, the best known being intraductal carcinoma of the breast (also treated with radiotherapy).
Carcinoma in situ
Ductal carcinoma in situ
Acinic cell carcinoma
Epithelial dysplasia
Lobular carcinoma in situ
Field cancerization
Squamous intraepithelial lesion
Atypical adenomatous hyperplasia