Interventional Radiologists can assist with the diagnosis of cancer by performing an image guided needle biopsy of the abnormal tissue mass. Using image guidance, an Interventional Radiologist can insert a small needle into the mass and remove a tissue sample. The sample is then given to a pathologist to determine the cause of the abnormal tissue. Needle biopsies are typically an outpatient procedure with infrequent complications. In about 90 percent of patients, needle biopsies provide enough tissue for the pathologist to determine the cause of the abnormality.