PMC6159262_01
Plain CT (a, b) of the chest demonstrates a mass with soft-tissue density, about 2 x 1 x 1 cm3, on the lateral wall of the trachea. (a) Coronal plane. (b) Sagittal plane.
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Plain CT of the chest revealed a mass with well-circumscribed soft-tissue attenuation, which measured about 25 Hounsfield units (HU) on the lateral wall of the trachea (Figure 1a,b).
Contrast-enhanced CT of the chest (a-c) 30, 60 and 120 s after injection. Density of the lesion: (a) 122 HU; (b) 103 HU; (c) 85 HU.
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Contrast-enhanced CT revealed marked homogeneous enhancement (Figure 2a-c), with the highest density of 122 HU in the arteries that declined gradually to 85 HU at 120 s after injecting the contrast medium.
Microscopic appearance of the lesion. (a, b) Haematoxylin and eosin staining (magnification 10 x 10, 10 x 20). (a) Hyperplasia of blood vessels, lymphoid tissue and lymphoid follicles in the lesion. (b) Germinal centre of the follicle.
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Microscopically, the lesion was composed of a large amount of lymphatic tissue and hyperplastic vascular and lymphoid follicles, with atrophy of the germinal centre (Figure 3a,b).