Fig. 5.

Type-B2 thymoma in a 35-year-old woman.

A. Enhanced 10-mm-collimation CT scan obtained at the level of the right interlobar pulmonary artery shows that in the anterior mediastinum, a slightly attenuated heterogeneous mass is present.

B. CT scan (10-mm collimation) obtained at the level of the suprahepatic inferior vena cava depicts a pleural mass lesion (arrows) with low attenuation.

C. T1-weighted MR image obtained at a similar level to A shows a mass lesion with high-signal intensity.

D. T2-weighted image depicts a slightly heterogeneous high-signal lesion.

E. Photomicrograph (original magnification, × 1; hematoxylin-eosin staining) shows an invasive tumor bud (arrowheads) penetrating the capsule where there is no fibrous sleeve.