Diagnostic exam results for case 1. Chest enhanced CT (A) and T2-weighted MRI (B) showed a well-defined and ovoid mass located in the paravertebral sulcus without invasion of the vertebral body or intraspinal canal. The microscopic appearance of the area with a solid growth of primitive cells is shown (C). The lesion was highly cellular (low-power view). The tumor nest was composed of primitive cells with round or oval hyperchromatic nuclei and scant cytoplasm (high-power view).