Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no vascular congestion or pleural effusions . Previously identified bilateral atelectasis has improved although there is patchy right infrahilar and left basilar opacities suggestive of minor atelectasis . Bilateral central pulmonary arterial enlargement is unchanged . Mild cardiomegaly is unchanged .
    OUTPUT:
    
No evidence of acute cardiopulmonary process . No definite evidence of pneumonia .