Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study , no relevant change . Cardiac silhouette is top - normal in the mediastinal silhouette shows unfolded aorta . Enlargement of the hila is compatible with underlying pulmonary arterial hypertension , unchanged . No pneumothorax or pleural effusions .
    OUTPUT:
    
No acute cardiopulmonary process . Enlargement of the hila compatible with known underlying pulmonary arterial hypertension .