A technique for the chemical fixation of cutaneous tumors followed by serial excision using microscopic control has been developed since the mid 1930s. Mohs micrographic surgery is the most reliable and cost effective treatment modslity, offering maximal preservaticn of normal tissue and therefore the lowest functional and cosmetic morbidity in the cancer treatments. We report a case of basal cell carcinoma treated with Mohs micrographic surgery and reconstructed with nasalis myocutaneous sliding flap. The pstient was a 56-year-old woman, who had a been sized basal cell carcinoma on her nasal tip for the previous 3 years. The lesion was removed under complete microscopical control using fresh tissue technique. The defect healed with atrophic scar formation ore and half months later. To remove scar tissue and to gsin proper cosmetic results, reconstruction with nasalis myocutaneous sliding flap was performed successfully. (Kor J Dermatd 1993;31(4):586-599)