Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Enlarged caliber of the main pulmonary arteries bilaterally may indicate underlying pulmonary arterial hypertension . Heart size is top - normal and there is no consolidation or evidence of pulmonary edema . Obscuration of the costophrenic angles bilaterally indicate effusions .
    OUTPUT:
    
Enlarged main pulmonary arteries suggesting pulmonary arterial hypertension . No evidence of pulmonary edema or pneumonia .