Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Medial right lung base opacity projecting over the heart on the lateral view corresponds to chronic right middle lobe collapse . No new confluent consolidation is identified . Lung volumes are reduced compared to the prior exam . There is no pulmonary edema or large pleural effusions . Mediastinal and hilar contours are within normal limit . Moderate cardiomegaly is unchanged . A pacemaker generator overlies the left chest wall . Three leads appear intact and in unchanged position .
    OUTPUT:
    
No acute cardiopulmonary process .