case_images: PMC6453800_01
case_images: Computed tomography of the chest showing the localization of this tumor. This tumor was located in the anterior mediastinum and showed mixed cystic and solid lesions.
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case_images: PMC6453800_01_gr1.jpg
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case_images: This tumor was composed of cystic and solid lesions (Fig. 1).
case_images: The pathological finding of this tumor. The tumor cells were mainly composed of papillary adenocarcinoma cells and type A thymoma (a). Immunohistochemical (IHC) staining was positive for MUC1 and CD5 (b and c) but negative for TTF-1 (d).
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case_images: PMC6453800_01_gr2.jpg
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case_images: These two microscopically separate tumors were diagnosed as a thymic papillary adenocarcinoma and a type A thymoma (Masaoka stage I) (Fig. 2a). TTF-1, calretinin and thrombomodulin (Fig. 2b-d). The second tumor was type A thymoma. This tumor consisted primarily of spindle-shaped epithelial cells and many lymphocytes without atypia (Fig. 2a).