FIGURE 4
From: Clinicopathologic and DNA Cytometric Analysis of Carcinoid Tumors of the Thymus

Combined tumor with features of carcinoid and thymoma. A, areas with features of carcinoid tumor display several rosettes, some tumor cells being oncocytoid with abundant cytoplasm (left), and tumor cells being argyrophilic by Grimelius stain (right). B, there were cystic and frequently dilated perivascular spaces in areas of epithelial cell–predominant thymoma.