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(A) This frozen section (FS) of a sentinel lymph node demonstrated the presence of a micrometastasis that was not noted in touch imprint, rapid cytokeratin immunostain of FS, or permanent histopathologic examination of the same lymph node. (B) Rapid cytokeratin immunostaining of a sentinel lymph node revealed a micrometastasis. This tumor deposit was not noted on touch imprint, frozen section, or permanent histopathologic examination of the same lymph node.
