(BY-ahp-see) A procedure to remove cells or tissue in order to look at them under a microscope to check for signs of disease.
When an entire tumor is removed, it is an excisional biopsy. When only a sample of tissue is removed, it is an incisional biopsy. When a sample of tissue or fluid is removed with a needle, it is a core or needle biopsy or fine-needle aspiration.
This diagram shows a core/needle biopsy of the prostate, done with an ultrasound probe.
Samples taken in a prostate biopsy are often called cores.
Results are in a pathology report.