Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . The mediastinal and hilar contours are unremarkable . Hyperinflation of lungs with emphysematous changes , most pronounced within the lung apices is again demonstrated . Ill - defined patchy opacity within the right lower lobe appears slightly improved when compared to the prior study , but persists . Additionally , continued patchy ill - defined opacity within the left lower lobe is not significantly changed in the interval . No pleural effusion or pneumothorax is identified . There is no pulmonary vascular engorgement . Scarring within the left upper lobe is stable . There is no pneumothorax . Multilevel degenerative changes of the thoracic spine are redemonstrated .
    OUTPUT:
    
Slight interval improvement in ill - defined patchy opacity within the right lower lobe likely representing pneumonia . Patchy opacity in the left lower lobe may be reflective of atelectasis , though infection in this region also can not be excluded , but appears relatively unchanged compared to the prior study .