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EBUS-TBNA samples demonstrating metastatic breast cancer. A, FNA smear shows malignant cells (MGG). B, Cell block preparation contains numerous malignant cells (HE). C, TTF-1 negative staining. D, CK7 positive staining. E, CK20 negative staining. F, ER staining negative. EBUS-TBNA, endobronchial ultrasound-guided transbronchial needle aspiration; MGG, May Grunwald Giemsa stain; HE, hematoxylin and eosin; TTF-1, thyroid transcription factor-1; CK, cytokeratin; ER, estrogen receptor.
