Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Enlarged opacity abutting the right mediastinum is the patient 's known dilated esophagus . Opacities at the left lung base are either atelectasis , likely due to low lung volumes versus aspiration in the right clinical context . There are no pleural effusions or pneumothorax . The cardiac silhouette is normal in size .
    OUTPUT:
    
Findings compatible with known achalasia and atelectasis versus aspiration in the left lower lobe .