How is a core needle biopsy performed?
Core needle biopsy is a simple procedure usually performed in a doctor’s office with a local anesthetic. CNB is performed using an 11-18 gauge needle (larger than the one used in FNA). The person performing the exam will first clean the skin above the area to be sampled to prevent infection. A small nick will be made in the skin and the needle is inserted through this nick into the center of the lesion. When the lesion is reached a sample of tissue is removed. Steri-Strips are used to close the small cut and a larger bandage is placed to protect the wound. In some cases ultrasound will be used to accurately guide the needle into the lesion.
