Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study , the left lower lobe pneumonia is significantly improved . There is mild central pulmonary vascular congestion . The lung volumes are normal . The cardiomediastinal contour is normal . There is no pleural effusion . Glenohumeral and acromioclavicular joint degenerative disease noted bilaterally , with bilateral high riding humeral heads consistent with chronic rotator cuff disease . Otherwise , the bones and soft tissue structures are unremarkable . There is no free air underneath the right hemidiaphragm .
    OUTPUT:
    
1 . Mild central pulmonary vascular congestion . 2 . Significant interval improvement in the left lower lobe pneumonia .