Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient has a right - sided aortic arch , better assessed on CT . There is diffuse increase in interstitial markings bilaterally . Right infrahilar opacity is seen some also present on prior study is , difficult to discern interval change given differences in modality / technique . Rounded opacity in the superior left upper lobe was better assessed on CT . No pleural effusion or pneumothorax is seen . Cardiac and mediastinal silhouettes are grossly similar as comparison to chest CT scout image from ___ with the cardiac silhouette possibly slightly smaller in size .
    OUTPUT:
    
Diffuse increase in interstitial markings bilaterally could be due to chronic lung disease , relate to patient 's malignancy , component of edema or infection not excluded . Known right infrahilar opacity . Subtle superior left lower lobe opacity , better assessed on CT .