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FIG 1. Contrast-enhanced CT scan of the neck shows a well-defined, round mass in the left jugulodigastric area (arrows). The mass enhances peripherally with central hypoattenuation. It compresses the internal carotid artery medially. Two lymph nodes of less than 1 cm in diameter were also noted in the posterior neck. No evidence of abnormality was seen in left tongue base.FIG 2. The tumor is composed of a mixture, in varying proportions, of epithelial cells and lymphocytes. Hassall's corpuscle, which is typically demonstrated in thymoma, is noted (arrowheads) (magnification, x40).FIG 3. Follow-up contrast-enhanced CT scan of the neck, obtained 1 year after surgery, shows a 2 x 3-cm, ill-defined mass in the left tongue base (arrows). This mass is isodense to the tongue muscle. Several conglomerate nodules are noted in left posterior neck (arrowheads), which show central hypoattenuation with peripheral rim enhancement
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