If breast cancer has pelvic metastasis, there may be pelvic pain, especially when moving around, which will increase. If CT or MRI of the pelvis is done, it may reveal bone destruction in the pelvis, most of which is osteolytic and some of which is osteogenic. In the case of osteolytic bone destruction, pathological fractures may occur. In case of pelvic metastasis, a whole-body bone scan is also needed to see if there are metastases in other parts of the body. If the pelvic metastases are painful and severe, local radiotherapy may be considered. If you are physically able to do so, systemic chemotherapy is required. Through comprehensive treatment, it is possible to prolong the life of the patient even if the breast cancer has metastasis in the pelvis, and even to achieve long-term survival.