Figure 1From: Pneumatosis intestinalis and portal venous gas secondary to Gefitinib therapy for lung adenocarcinoma 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).Back to article page