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Definition of margin positivity (a) Neoplastic cells are close but not in contact with the ink. The distance between the inked margin and the neoplastic cells is pointed with a double-sided arrow. (b) Neoplastic cells are in contact with the ink. This is considered a positive margin. Three asterisks indicate the area of margin infiltration. (c) Cautery artifact in neoplastic cells in contact with the ink. An asterisk highlights the area of cautery effect. (400× magnification).
