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Metastatic small cell carcinoma of the lung; a) Many loose, small, mildly pleomorphic cells with high nuclear to cytoplasmic ratios are seen. Some cells are densely crowded into small clusters with nuclear molding (40×, Diff-Quik stain); b) Round nuclear outlines, absent or minimal nucleoli, and smooth, dark chromatin (40×, Papanicolaou stain); c-e) CD56, synaptophysin and Ki67 are expressed, supporting the diagnosis of metastatic small cell carcinoma (40×, immuno)
