Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a normal cardiomediastinal silhouette and somewhat hypoinflated lungs . There is mildly increased opacity in the left lung base , without definite correlating consolidation on lateral view . This may be atelectasis , but pneumonia can not be excluded . There is no pleural effusion or pneumothorax . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Increased opacity in the left lung base , which could be atelectasis , but pneumonia can not be excluded .