Fig. 1. (A) Horizontal view and (B) (frontal view): Chest CT showing anterior mediastinal tumor measuring 50 × 48 × 20 mm with ring calcification. (C) Type B1 thymoma (right side) outside the ring calcification (left side). (D) Horizontal view and (E) frontal view: Enhanced chest CT revealed the anterior mediastinal tumor measuring 50 × 40 × 20 mm with ring calcification, which was suspected to have invaded the superior vena cava (arrow). (F) Type B2 thymoma (left side) outside of the ring calcification (right side).
