Chapter 5 Cancer and benign tumours/Fig 5.26.jpg

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This needle biopsy is from the paraspinal tissue of a 40-year-old woman. The H&E-stained section (A) shows an adenocarcinoma. Strongly positive immunostaining for thyroid transcription factor 1 in the nuclei (B), and cytokeratin 7 in the cytoplasm (C), indicate that the likely primary is in the lung.