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Metastatic breast carcinoma in a patient (Patient IV) with unknown primary. There are clusters of tumor cells with enlarged and irregular nuclei compared to the adjacent pancreatic ductal ells (Diff‐Quik stain in A and Pap stain in B, 400X). Intracytoplasmic mucin is seen in the cell block (C, 400X). The tumor cells are positive for HER2 3+ (D, 400X). Inserted picture displays the tumor cells are positive for GATA3 (400X).
