Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate low lung volumes . Linear opacities at the lung bases most likely represent atelectasis . There is no large pleural effusion . There is no pneumothorax . The heart is stably enlarged . Mediastinal and hilar contours are unchanged .
    OUTPUT:
    
Linear opacities at the right lung bases most likely represent atelectasis . No definite evidence of pneumonia .