Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are unremarkable . There is lung volumes are low . There is no pleural effusion or pneumothorax . Opacities at the lung bases are faint but greater on the right than left . Elsewhere , lungs appear clear .
    OUTPUT:
    
Basilar opacities , probably compatible with atelectasis , although developing pneumonia is not excluded .