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A biopsy is a medical procedure in which a small sample of tissue is taken from the body to be examined for signs of disease or abnormality. It is usually done to diagnose or rule out conditions such as cancer, infections, or inflammatory diseases. The sample is typically taken using a needle or surgical tool, and it is sent to a laboratory for analysis. Depending on the location and size of the biopsy, the procedure may be done with local anesthesia or under general anesthesia.