Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate prominence of the main pulmonary and right pulmonary artery , unchanged compared to ___ , suggestive of underlying pulmonary arterial hypertension . Visualized cardiac contour appears unchanged . Lung volumes are low , but otherwise clear . No pleural effusion or pneumothorax identified .
    OUTPUT:
    
Prominence of main and right pulmonary possibly due to pulmonary arterial hypertension , unchanged compared to ___ . No focal opacification is evident .