Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is interval improvement in the previously seen left upper lobe and left lower lobe opacities consistent with gradual resolution of infection or aspiration . A subtle opacity is also seen within the right upper lobe which may have been present on the prior radiograph in ___ , and therefore an underlying parenchymal lesion can not be excluded . There is no appreciable pleural effusion or pneumothorax . Plate - like atelectasis is noted at the left lung base . Cardiomediastinal silhouette is within normal limits . Atherosclerotic calcifications are noted at the aortic arch . No acute osseous abnormalities identified .
    OUTPUT:
    
Substantial but partial improvement in the left mid and lower lobe opacities consistent with gradual resolution of an underlying infectious process . Subtle right upper lobe opacity may have been present since ___ , and CT chest should be obtained to exclude an underlying parenchymal nodule .