A nodular opacity measuring approximately 9 mm in width is noted over the medial right clavicle, which may represent an azygos lobe in an azygos fissure. However, it could also be a scar in the right upper lobe. Further characterization with conventional PA and lateral chest radiographs, as well as an AP lordotic view, is recommended.
Pleural scarring (Uncertain) Nodule/Solitary lung nodule (Uncertain)