what happens when cancer goes to the brain
Metastasis occurs when breast cancer cells travel through the circulatory system and seed new cancer deposits called micrometastases. These tiny tumors are at first too small to detect, but in time the cells may keep on dividing in the new location. The tumors that the dividing cells form can only be detected by scans when they grow above a certain size, so a clear scan unfortunately doesnât mean that there is no cancer.