Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate an increased opacity projecting over the medial right lower lung . Although this could represent atelectasis , early pneumonia can not be excluded . Heart size is normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Increased opacity projecting over the medial right lower lung could represent atelectasis , but an early pneumonia can not be excluded .