1. Progressive enlargment of osteoma between scans

The prior scan (Canaray case 133216, dated 1 November 2016, and shown in greenscale) was overlaid on the current scan (shown in redscale). The red halo that is visible at the medial periphery of the entity in these overlaid images is indicative of progressive enlargement of the osteoma. Incidentally, a small green halo is visible in the inferior aspect of the osteoma, which is suggestive of a small zone of remodeling in this region. Overall, the osteoma continues to enlarge.