Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded with a very subtle opacity projecting over the lower thoracic spine . The border of the left posterior diaphragm is also somewhat indistinct . These findings together are suggestive of an early left lower lobe pneumonia . Otherwise , the lungs are clear with no pleural effusion , masses , lesions , or pneumothorax . The aorta is tortuous and calcified . Wedge compression of a lower thoracic vertebra of unknown chronicity is noted .
    OUTPUT:
    
Subtle opacity suspicious for early left lower lobe pneumonia .