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Immunohistochemistry positive for malignant cells consistent with metastatic adenocarcinoma of pulmonary origin (immunohistochemical stain not shown). Stains performed show a pattern consistent with pulmonary adenocarcinoma, specifically, the tumour is cytokeratin 7 positive, cytokeratin 20 negative, thyroid transcription factor 1 positive, napsin-A positive, villin negative, CDX2 negative and calretinin negative.
