Mohs surgery for melanoma in situ.

Mohs micrographic surgery is a valuable option for the treatment of melanoma in situ, especially lesions of the lentigo maligna subtype that are clinically ill defined. Complete peripheral margin assessment of a tumor's borders by means of frozen or permanent sections can help reduce the surgical defect size and maximize cure rate as compared with standard excision with preset 5-mm margins. This article reviews the different variations of Mohs micrographic surgery that are currently used for melanoma in situ.