The intervention is usually performed with local anesthesia and there is no need for hospitalization. With the Mohs technique the removal of the cancer is done by horizontal layers. While the patient waits in the clinic the tissues are processed. Then a gradual examination of the preparation takes place in horizontal sections allowing for a 100% examination of the surgical borders in three dimensions. If the borders are clear of cancer cells then the wound is closed. If not then the procedure is repeated removing only the area which contains cancer cells until a totally negative tissue examination is achieved.