良性肿瘤以膨胀性或外生性方式生长,逐渐增大,一般不会外侵、扩散。相反,恶性肿瘤不仅可以在原发部位继续生长、蔓延(直接蔓延),而且还可以通过多种途径扩散到身体其他部位(这种扩散医学上称为“转移”)。1、直接蔓延:随着肿瘤的不断增大,肿瘤细胞常常连续不断地沿着组织间隙、淋巴管、血管或神经束衣侵入并破坏邻近的正常组织或 Benign tumors grow in an expansive or exogenous manner and gradually increase in size, and generally do not invade or spread. On the contrary, malignant tumors can not only continue to grow, spread (direct spread) in the primary site, but also spread to other parts of the body through various channels (this type of diffusion medicine is called “metastasis”). 1, direct spread: As the tumor continues to increase, tumor cells often continue to invade along the tissue gaps, lymphatic vessels, blood vessels or nerve bundles and destroy adjacent normal tissue or