Increased linear opacity at the right lung apex with interval increased right paratracheal soft tissue may reflect post-radiation changes; however, contour abnormality suggests a centrally obstructing mass with right apical atelectasis. Correlation with the patient's history is recommended. Repeat PA and lateral upright views may be of use, or consider cross-sectional imaging.
Atelectasis (Uncertain) Mass/Solitary lung mass (Uncertain)