PMC6010670_01
Chest computed tomography revealed a well-margined mass in the anterior mediastinum with a diameter of 31 mm (A). Total thymothymectomy was performed (B), and the histological findings of the mediastinal tumor confirmed the diagnosis of type AB thymoma (2015 WHO classification). Some areas had storiform pattern of spindle shaped epithelial cells and others had increased numbers lymphocytes with round or polygonal epithelial cells (C).
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A 74-year-old Japanese woman with a mediastinal tumor was referred to our hospital (Fig. 1A). She underwent total thymothymectomy and the tumor was pathologically diagnosed as type AB thymoma (the 2015 World Health Organization Classification of tumors of the thymus) (Fig. 1B and C).