Pathological features of a cell block from the malignant pleural effusion. Histological examination of the cell block revealed metastatic adenocarcinoma (A, H&E × 400). Immunohistochemistry showed that the tumor cells were positive for (B) cytokeratin 7 and (C) thyroid transcription factor-1 (× 400).
Lee et al. BMC Cancer 2012 12:87 doi:10.1186/1471-2407-12-87