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An example of invasive mucinous adenocarcinoma of the lung demonstrating lepidic and acinar patterns (A), diffuse CK7 expression (B), focal CK20 expression (C), scattered foci with weak TTF1 (D) and/or Napsin-A (E) expressions, and weak to moderate CDX2 expression (F). Of note, the entrapped type II pneumocytes are reactive to CK7 (B), TTF1 (D) and Napsin-A (E).
