Fig. 7

a Hematoxylin and eosin 10×. Section of the specimen demonstrates infiltrative tumor cells in fibrous tissue; b high power view. Tumor cells with marked cytological pleomorphisms. There is abundant pink or clear cytoplasm. Nuclei are round to oval with irregular nuclear contour and hyperchromatic chromatin. Mitoses are frequently identified. Based on morphologic features, diagnosis of poorly differentiated carcinoma is suspected