Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is moderately enlarged but unchanged . The mediastinal contours are stable . Enlargement of the main pulmonary artery is again demonstrated compatible with pulmonary arterial hypertension . There is mild perihilar haziness and vascular indistinctness suggesting mild pulmonary edema . No focal consolidation , pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild pulmonary edema , similar compared to the prior exam .