Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval marked improvement in pulmonary edema with only minimal residual interstitial edema remaining . Associated decreased size of cardiac silhouette now upper limits of normal . Enlarged central pulmonary artery suggests the possibility of pulmonary arterial hypertension . Small pleural effusions have decreased in size . Bones are diffusely demineralized , and note is made of previous vertebroplasty at the site of a compression fracture in the mid thoracic spine . Note is also made of hyperexpansion of the lungs suggesting underlying COPD .
    OUTPUT:
    
1 . Marked improvement in pulmonary edema . 2 . Enlarged central pulmonary arteries , suggesting the possibility of pulmonary arterial hypertension .