There is a moment when a surgeon is removing a skin cancer, delicately cutting away as little tissue as possible, when he or she needs to know if the procedure got the entire tumour.
Any residual cancerous tissue must be removed, but the object of the Mohs surgical procedure is to make as small an excision as possible, leaving little or no evidence there was ever a cancer or an operation to remove it. This is especially important if the cancer is on the face and requires plastic reconstruction.
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