PMC8794379_01
A 58-year-old man with newly diagnosed prevascular mediastinal mass. Unenhanced chest CT demonstrates a spherical 2.7x1.8 cm ovoid well-demarcated soft tissue mass (arrow in A) in the prevascular mediastinum, abutting the ascending aorta (Ao) but separated from it by a sliver of fat. The pleura is normal, but there are two pulmonary nodules. One is benign as it is heavily calcified (arrow in B) and remained stable compared to a CT performed 9 years earlier (arrow in C). The other nodule, in the left lobe (arrow in D), is lobulated, solid left, and not calcified. It gradually grew over the years currently measuring 1.6x1.1 cm in diameter, whereas in a preceding CT performed 4 years earlier it measured 1.4x0.8 cm in diameter (arrow in E), and 9 years prior to the current CT it measured 1.2x0.7 cm in diameter (arrow in F).
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An unenhanced chest CT demonstrates an ovoid 2.7x1.8 cm well-demarcated soft tissue mass in the prevascular mediastinum (Figure 1A), which is new compared to two prior chest CT scans performed 4 and 9 years prior. The nodule in the left upper lobe (LUL) is likely benign, since it is heavily calcified (Figure 1B) and has been stable for 9 years (Figure 1C). However, there is a solid non-calcified nodule in the left lower lobe (LLL) that has gradually increased in size to 1.6x1.1 cm over the past 9 years (Figure 1D,E,F).