Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . There is consolidation and volume loss at the left lung base which could represent atelectasis though given history a small component of pneumonia can not be entirely excluded . The right lung appears clear . Heart size appears normal . No large pleural effusion or pneumothorax is seen . Bony structures are intact .
    OUTPUT:
    
Probable atelectasis accounting for opacity at the left lung base though an early / mild component of pneumonia is difficult to exclude .