Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are bilateral predominantly perihilar opacities , left greater than right , worse since ___ . The heart is not enlarged . The mediastinal and hilar contours are normal . There is no large pleural effusion or pneumothorax . Small hiatal hernia is redemonstrated . This is unchanged .
    OUTPUT:
    
Bilateral perihilar opacities , left greater than right , may reflect multifocal pneumonia or aspiration . Atypical infection such as PCP should be strongly considered .