Fig. 2
Representative MR images of TETs with various T stages. a-d A 65-year-old male with T1 type B2 thymoma. Axial pre-, post-gadolinium T1WI (a, b) and black-blood T2WI (c) showed a well-defined tumor in the prevascular mediastinum. The freehand region of interest (ROIs) were manually drawn on the ADC map, and the ADC value was 2.07 × 10–3 mm2/sec (d). He underwent video-assisted thoracoscopic surgery/ thymothymectomy. e–h A 33-year-old female with T2 type AB thymoma. Axial pre-, post-gadolinium T1WI (e, f) and T2WI (g) showed a lobulated tumor in the prevascular mediastinum with pericardial invasion and left pleural seeding tumor (arrow). The ADC value was 1.57 × 10–3 mm2/sec (h). She underwent left thoracotomy thymectomy and pleural tumor excision. i-l A 41-year-old male with T3 thymic carcinoma. Axial pre-, post-gadolinium T1WI (i, j) and T2WI (k) showed an irregular tumor with the left upper lobe (LUL) lung (asterisk) and extrapericardial pulmonary artery (PA) invasion (arrow). The ADC value was 1.36 × 10–3 mm2/sec (l). He received neoadjuvant concomitant chemoradiotherapy and underwent full sternotomy thymothymectomy, left mini-thoracotomy with rib spreading LUL lobectomy. m-p A -64-year-old male with T4 thymic carcinoma. Axial pre-, post-gadolinium T1WI (m, n) and T2WI (o) showed an irregular tumor with intrapericardial PA (arrow) and LUL lung invasion (asterisk). The ADC value was 1.19 × 10–3 mm2/sec (p). He received neoadjuvant concomitant chemoradiotherapy, followed by underwent thymothymectomy, partial pericardiectomy, cardiopulmonary bypass for pulmonary trunk reconstruction with Bovine patch, and LUL wedge resection