Fig. 2
From: Thymic adenocarcinoma presenting as an incidental mediastinal mass
A Low power view showing multiple epithelial lined cysts separated by fibrous stroma with pools of tumor necrosis. B High power view showing pleiomorphic epithelial cells with prominent nucleoli, mitotic figures, and apoptotic cells. (2C) CDX2 stain, a specific marker of intestinal differentiation, showing focal and varying positivity in the lesional nuclei