Figure 2From: Metastasis to the breast from an adenocarcinoma of the lung with extensive micropapillary component: a case report and review of the literaturePleural effusion aspiration smears. a) Clusters of malignant cells with morphological features of adenocarcinoma (Papanicolaou stain, ×400). b) Clusters of malignant cells with morphological features of adenocarcinoma (Papanicolaou stain, ×600). c) Immunocytochemical positivity to TTF-1 (×350). d) Immunocytochemical positivity to TTF-1 (×280).Back to article page