Explanation
The yellow outline in the movie indicates the location of the left first rib. The left second rib is indicated in pink.
A clinical example is shown below of abnormal ribs for comparison.
Image A shows an unlabeled CT image.
Image B shows the chondrosarcoma originating in an anterior left upper rib, outlined in red. The mass contains considerable calcification, with a somewhat swirling shape that is characteristic of lesions arising from cartilaginous cells, shown in blue.
