Sentinel lymph node biopsy for melanoma: a critical update for dermatologists after two decades of experience.

The technique of lymphatic mapping and sentinel node biopsy represents a minimally invasive approach to accurately stage the regional lymph node basin as a component of the initial management of selected patients with stage I and II cutaneous melanomas. In addition to its significant role in accurate regional nodal staging and prognosis, important goals of this procedure include improved regional disease control and possible survival benefit. After 20 years of experience, questions and some controversy persist. This review provides the dermatology community with a critical analysis of major publications that have defined the role of sentinel node biopsy, addresses several contemporary issues, and provides recommendations for appropriate patient referral.