A percutaneous core needle biopsy allows a physician to obtain a large sample of tissue under local anesthesia, and is usually performed on an outpatient basis. It is an image-guided biopsy using x-ray, computed tomography (CT), ultrasound or magnetic resonance (MR). A core needle biopsy is used for the diagnosis of tumors or non-cancerous conditions such as infection. An automated core biopsy set with an introducer needle promotes more rapid attainment of tissue samples with less damage to the tissue or discomfort to the patient.