Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to prior x-ray , there is more conspicuous opacity at the right lung base medially with a more rounded configuration on the frontal views . Increased less well the found surrounding opacity is also noted at the right lung base as well . There is a small right pleural effusion . Biapical scarring is again noted . The left lung is otherwise clear . There is pulmonary vascular congestion without overt edema . Cardiomediastinal silhouette is stable . No acute osseous abnormalities . Right chest wall dual lead pacing device is again noted . Mid thoracic compression deformity is unchanged from prior CT .
    OUTPUT:
    
Progression of opacity at the right lung base potentially in part due to post obstructive atelectasis given known increasing infrahilar soft tissue on prior CT scan . Superimposed infection would be possible . More rounded nodule at the right lung base could represent a pulmonary nodule . Followup will be necessary .