Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate enlargement of the cardiac silhouette is unchanged compared to prior study . Enlargement of the hila bilaterally is also stable , which may be related to pulmonary arterial hypertension . The aortic knob demonstrates mild calcifications . There is minimal pulmonary vascular congestion . No pleural effusion or pneumothorax is present . Streaky opacities in the lung bases likely reflect atelectasis . No acute osseous abnormality is seen .
    OUTPUT:
    
Cardiomegaly with mild pulmonary vascular congestion and mild bibasilar atelectasis . Enlargement of the hila bilaterally suggestive of underlying pulmonary arterial hypertension .