Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are normal . Plethora of pulmonary vasculature seen on the previous exam has improved substantially . Lungs are clear bilaterally . Heart size is normal and cardiomediastinal contours are unremarkable . No pleural effusion and no pneumothorax .
    OUTPUT:
    
Normal radiographic study of the chest .