Cryosurgery; drawing shows an instrument with a nozzle held over an abnormal area on the lower arm of a patient. Inset shows a spray of liquid nitrogen or liquid carbon dioxide coming from the nozzle and covering the abnormal lesion. Freezing destroys the lesion.
Cryosurgery. An instrument with a nozzle is used to spray liquid nitrogen or liquid carbon dioxide to freeze and destroy abnormal tissue.