OverviewA needle biopsy is performed under local anesthesia. Simple aspirations are performed with a small gauge needle to attempt to draw fluid from lumps that are thought to be cysts. Fine needle biopsy uses a larger needle to make multiple passes through a lump, drawing out tissue and fluid. Withdrawn fluid and tissue is further evaluated to determine if there are cancerous cells present.
Update Date 11/15/2013
Updated by: Debra G. Wechter, MD, FACS, General Surgery practice specializing in breast cancer, Virginia Mason Medical Center, Seattle, Washington. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.