Fig. 1

Imaging features of the lesion. a, b Axial and sagittal post-contrast MRI demonstrates an avidly enhancing lesion in the L1 pre-vertebral soft tissues. There is anterior displacement of the aorta (Ao, black arrow) and inferior vena cava (IVC, white arrows). There is invasion of the L1 vertebral body, with cephalad and caudad extension of disease and secondary pressure erosion of the ventral cortices of T12 (black arrowhead) and L2 (white arrowhead) vertebral bodies. c Concurrent contrast-enhanced CT image at the level of L1 shows an avidly enhancing mass (between large black arrows) with invasion of the L1 vertebral body. The CT shows rim of sclerosis in the vertebral body indicative of secondary invasion from a soft tissue mass. The aorta and inferior vena cava (black and white arrows, respectively) are anteriorly displaced. d Contrast-enhanced CT at end of therapy shows significant decrease in size and degree of enhancement of the mass (between large black arrows). Mass effect on the aorta and inferior vena cava (black and white arrows, respectively) has also decreased