Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Basilar opacity seen on the lateral view best corresponds to a retrocardiac opacity suspicious for developing left lower lobe pneumonia or aspiration event in the setting of altered mental status . Chronic peribronchiolar opacities seen bilaterally are similar in distribution and slightly more apparent due to lower lung volumes and AP technique . There is no pleural effusion or pneumothorax . The heart size is normal with normal cardiomediastinal silhouette .
    OUTPUT:
    
Left lower lobe opacity likely reflects pneumonia or aspiration .