Fig. 1

Magnetic resonance imaging (MRI) before (a, b) and after treatment (c, d). a the chest coronal MRI showed a dumbbell-shaped mass (arrow) extending to the spinal canal and paravertebrally through an enlarged intervertebral foramen; b sagittal MRI indicated that the mass was located in the spinal canal between T3 and T5 (arrow) and measured up to 5 cm in length. The spinal cord was compressed and displaced; c coronal MRI showed that there was no mass found in the thoracic cavity; d sagittal MRI showed that there was no mass found in the spinal canal between T3 and T5