Biopsy
A tissue sample, usually taken for microscopy, to look for altered cells. A biopsy is taken from a living organ or tissue in the patient. One of the most used types is fine needle biopsy, where a long needle is directed to the target organ/tissue, guided by X-ray, CT or ultrasound. Through the needle a small sample of tissue is withdrawn. Other means of taking biopsies are through fibre-optic instruments or during surgery, as an aid to decide whether to remove a lesion entirely, only a part of it or not at all.
GE Healthcare Glossary