Correct!
5. More than one of the above
The close contact with the chest wall, extension of the lesion into the adjacent chest wall musculature between the rib interspaces (Figure 4R-U), and the rib periosteal reaction all suggest that the lesion arises from the chest wall soft tissues, although a pleural origin is possible. The features of the lesion are not consistent with a lung origin, and the lesion is lateral to the lateral margin of the posterior mediastinum and therefore does not originate from this compartment.
A prior whole-body screening MR from one year earlier was located for comparison (Figure 4).
Figure 4. A previous whole-body screening MR 1 year earlier compared to the enhanced chest CT. Axial enhanced chest CT images (A-C) through the left posterior inferior thoracic mass (arrows). Selected images from the whole-body unenhanced MR exam (D-I) show the lesion (arrows) was present one year earlier and has probably enlarged somewhat during the interval. Right: video of MR exam in lung windows.
Which of the following represents an appropriate interpretation for this examination? (Click on the correct answer to be directed to the ninth of 11 pages)