Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aortic knob is calcified . Mediastinal and hilar contours are unremarkable . Lung volumes are slightly low . Patchy ill - defined opacity in the left mid lung field is concerning for an area of infection . Mild blunting of the costophrenic angles bilaterally may suggest the presence of trace effusions . There is crowding of the bronchovascular structures . No pneumothorax is identified . There are no acute osseous abnormalities . Multilevel degenerative changes in the thoracic spine are present .
    OUTPUT:
    
Patchy opacity in the left mid lung field concerning for pneumonia . Possible small bilateral pleural effusions .