Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate stable severe cardiomegaly . Unchanged prominence of the main pulmonary artery suggests pulmonary arterial hypertension . There has been a substantial improvement in previously noted layering pleural effusion with only a small residual effusion noted on the right . No focal opacification concerning for pneumonia . No pneumothorax identified .
    OUTPUT:
    
Stable severe cardiomegaly . Substantial improvement in pulmonary edema and pleural effusions with only small residual right pleural effusion . Findings suggest pulmonary arterial hypertension .