Fig. 1

MRI of the thorax reveals a spherical tumour lesion. Rib tumour lesion is presented with lobulated contours, measuring 30 × 50 × 20 mm, located at the medial sector of the posterior arch of the fourth right rib and the adjacent chest wall, at the level of the costovertebral junction. A loss of normal bone structure is notable in the described sector. a, Heterogeneous lesion is slightly hyperintense, dominantly isointense to muscle on FSE T1W images; b, Intravenous administration of paramagnetic contrast agent resulted in tumour enhancement on T1W images; c, On fat-suppressed T2W image a heterogeneous hyperintensity to muscle is obvious; d, On fat-suppressed T2W image, two tubular structures, 2.5 mm in size, were seen arising from intercostal blood vessels adjacent to the tumour mass; e, Selective angiography revealed a non-homogeneous vascular tumour mass supplied by the three feeding arteries, two of which were proximal and very thin, less than 1 mm in diameter. The diameter of the largest, distal artery was 2.2 mm. Scale bar: 10 cm