Abstract
Liquid nitrogen, obtained by the distillation of liquid air, is used in cryogenics since it condenses to −196°C at atmospheric pressure. Cryosurgery is based on the osmotic pressure difference, during the freezing and thawing cycles with liquid nitrogen, leading to intracellular edema, with the consequent rupture of the cell membrane, leading to apoptosis. The technique is simple, easy to perform, dispensing with the use of anesthetics, and with excellent aesthetic result. The technique involves the use of a cryotherapy probe, and several cycles of freezing and thawing are performed. The patients are re-evaluated after 15 days; if necessary, other sessions may be required. In these cases, the average was obtained from 3 sessions, with 4 to 5 cycles per consultation. Extensive lesions may require prolonged treatment for a few months. We will show some lesions treated with cryosurgery such as ranula, mucocele, hemangiomas, pyogenic granuloma, and varicosities, among others.
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