Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild - to - moderate cardiomegaly . Calcification in the aortic knob is noted . Otherwise , the mediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax . The lungs are well expanded without focal consolidation concerning for pneumonia . A 1 .0 cm round opacity projects at the lung base posteriorly , best seen on the lateral view . This is not definitively identified on the frontal view but may be present at the left lung base . The upper abdomen is unremarkable . Surgical clips are noted projecting over the breast tissue on the lateral view .
    OUTPUT:
    
1 . No evidence of acute cardiopulmonary process . 2 . Apparent round opacity projecting over the posterior lung bases on the lateral view . Chest CT is recommended when clinically appropriate .