1st year med student here, so I hope I'm not intruding. I've been given an article to review, but I need answers to basic questions. In the article, the path report for a patient states that they have a thin melanoma with a tumor thickness of .91mm and the guidelines for surgical excision margins state that 1-cm margins are appropriate for this melanoma. So my problem is that I've never seen any biopsies performed nor any surgical excisions, therefore I'm not sure when they state "1-cm margin" if it means: 1. cutting down to the epidermis to a depth of 1 cm Or 2. cutting a circle around the melanoma with a diameter of 1cm (in the hopes of getting normal tissue) Or 3. I believe in the case of Mohs, you take horizontal sections and go deep. With regards to the article, this excision is used for removal and not identification, so I'm not sure if that makes a difference or not. EDIT: Just wanted to state that the Clark level is IV. Thanks for any help!