Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There appears to be interval resolution of the pulmonic infiltrates previously seen . No new infiltrates are seen . There is a persistent lucency in the lung parenchyma adjacent to the left hilum that appears stable since ___ , which maybe suggestive of an underlying structural abnormality , congenital or otherwise . There is no evidence of pleural effusion or pneumothorax . The heart size is normal . The hilar and mediastinal contours are otherwise unremarkable . The visualized osseous structures are unremarkable .
    OUTPUT:
    
1 . Interval resolution of the central pneumonic infiltrates previously seen . 2 . Persistent lucent underlying structural abnormality in the lung parenchyma adjacent to the left hilum . This may be congenital in nature , however if clinically indicated / necessary , CT would provide better characterization of this abnormality .