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Many cancers are now diagnosed by needle biopsy. During this procedure, we use imaging techniques (such as CT, X-ray, ultrasound, or MRI) to guide the insertion of a fine needle into the patient's tumour. A small amount of tissue is removed and then examined by a pathologist to determine if cancer cells are present. Needle biopsies are less painful, less disfiguring, and result in a shorter recovery time than conventional surgical biopsy procedures.