Fig. 4From: Small-sized type A thymoma with pulmonary metastasis: a case reporta, b Hematoxylin and eosin staining of the pulmonary nodule. Pathological images are similar to those of an anterior mediastinal tumor. c–e An immunohistochemical analysis of the pulmonary disease. The tumor is noted to be positive for the anti-pan cytokeratin antibody (c), p40 (d), and paired box protein 8 (e)Back to article page