Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild pulmonary edema is improved from prior exam . Dilated main pulmonary artery is seen , compatible with pulmonary arterial hypertension . No large effusion is seen on this supine film . There is no pneumothorax . The cardiac silhouette is moderately enlarged but stable . Left - sided double lumen central venous catheter is seen with tip in the right atrium . Degenerative changes are seen in the right humeral head , better characterized on the dedicated exam . Surgical sutures are noted in the right upper quadrant .
    OUTPUT:
    
1 . Mild pulmonary edema , improved from the prior study . 2 . Dilated main pulmonary artery , compatible with pulmonary arterial hypertension .