Additional file 3: Fig S1. Mediastinal schwannoma (Case 7): a) Preoperative MRI for T2 sequence shows a right paravertebral mediastinal mass, which was ovoid with smooth edges, solid, and measuring 89 × 70 × 55 mm; b) Heterogeneous reinforcement after the application of intravenous contrast, without pleural infiltration, to either vertebral bodies or vascular structures; c) Follow-up CT three years after surgery only shows focal pleural thickening, with a homogeneous oval appearance in the upper right lobe posterior segment, measuring 3.4 × 1.6 cm, and a mean density of 10 HU (red asterisk), compatible with scar, and without evidence of tumor activity.