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Dysplastic nevi-markers and precursors of malignant melanoma.

or cavernous hemangiomas. The argon laser is mainly used to ablate vascular malformations and vascular tumors, but is also used to treat some benign pigmented lesions, warts, benign tumors and tattoos. Laser ablation of abnormal tissue does not differ qualitatively from other modes of tissue destruction. There are, however, a number of important advantages to this mode of treatment. Extreme localization of the beam minimizes perilesional injury. The laser is excellent at cauterizing small blood vessels so that a dry operative field and reduced postoperative edema are obtained. The wound is sterilized by the laser beam and, thus, one may operate in a contaminated field. In addition, postoperative pain is often less than with other destructive procedures because small nerve endings are sealed. There are several disadvantages to laser surgical procedures. The equipment is expensive and not highly portable. In addition, it is technically sophisticated and, thus, may be prone to major malfunctions. Because the beam is so powerful, human error in its use can lead to significant cutaneous burns or eye injuries. The near future should bring greater use of a newly developed tunable dye laser that uses a carefully chosen wavelength (577 nm), which is very selectively absorbed by blood. Thus, abnormal vascular channels can be ablated without damaging surrounding normal structures. NORMAN LEVINE, MD Tucson