case_images: PMC6159262_01
case_images: 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.
case_images: bjrcr.20160063.g001.jpg
case_images: PMC6159262_01_bjrcr.20160063.g001.jpg
case_images: f1
case_images: 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).
case_images: 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.
case_images: bjrcr.20160063.g002.jpg
case_images: PMC6159262_01_bjrcr.20160063.g002.jpg
case_images: f2
case_images: 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.
case_images: 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.
case_images: bjrcr.20160063.g003.jpg
case_images: PMC6159262_01_bjrcr.20160063.g003.jpg
case_images: f3
case_images: 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).