Metastasis, or the spread of cancer cells from one organ or part of the body to another, can be detected by a variety of imaging tests and biopsies. Imaging tests like X-rays, CT scans, MRI scans, PET scans, and ultrasound can help to detect the spread of cancer cells to other organs and areas of the body. Biopsies, or the removal of a small sample of tissue to be examined under a microscope, can also detect metastatic cancer cells. Additionally, blood tests can be used to measure certain markers that may indicate the presence of metastatic cancer. Treatment and management of metastasis can vary depending on the type and location of cancer and the patient's overall health.