Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes and underpenetration somewhat limit evaluation . Within limitation , the cardiomediastinal silhouette is mild - to - moderately enlarged . The hila are within normal limits . There is a retrocardiac opacity localizing to the left lower lobe , concerning for pneumonia or sequelae of aspiration in the appropriate clinical setting . Elsewhere , the lungs are clear . There is no pulmonary vascular congestion or pulmonary edema . There is no pneumothorax or sizable pleural effusion
    OUTPUT:
    
1 . Left lower lobe opacity is concerning for pneumonia or sequelae of aspiration in the appropriate clinical setting . 2 . Mild to moderate cardiomegaly . No pulmonary edema .