PMC5198868_01
Enhanced CT revealed a solitary mass severely compressing the trachea and sized 5.5 x 5.0 x 4.0 cm (A). Two years after the initial diagnosis, the tumor had enlarged lengthwise to 6.7 x 5.1 x 5.0 cm (B, C).
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The tumor was anterior to the trachea and dorsal to the innominate vein, and found to compress adjacent vessels and especially the trachea, with no invasion of surrounding tissues (Fig. 1).
The cut surface of the tumor showed a pale tan color and irregular lobulation.
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Macroscopically, the resected specimen was a firm tumor (6.5 x 5.0 x 5.0 cm) (Fig. 2).
Histological findings showed epithelial cells with oval nuclei and were compatible with type A thymoma (HE staining).
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Surrounding the small vessels, the perivascular lymphoid spaces were shown (Fig. 3).