Tumor
Tumor in medicine refers to the abnormal cell lesions, not necessarily the body above the mass. This kind of disease, so that the body part of the cells have uncontrolled proliferation, many will be assembled into a mass. Tumor is divided into benign tumors, malignant tumors. Benign tumor growth rate is slow, the surface is more smooth. Does not invade adjacent normal tissues. Around the tumor often form a capsule, so the boundaries with the normal tissue significantly. Unless long in the vital parts, benign tumors are generally not fatal, most can be completely removed, there is little recurrence. Cancer is the most common malignancy. Malignant tumors are divided into epithelial "cancer" and interstitial "sarcoma". In malignant tumors, some of these proliferating cells, in addition to being aggregated into lumps, also spread to other parts of the proliferation. Tumor cells compared with normal cells, there are structural, functional and metabolic abnormalities, they have more than normal proliferation, this proliferation and the body is not coordinated. Non-neoplastic hyperplasia and tumor hyperplasia different, the former often have obvious irritation factors, and the proliferation is limited to a certain degree and time, once this factor is eliminated, that is no longer proliferation, but beyond a certain limit, qualitative change, also Can be changed to tumor hyperplasia. ...