Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a rounded retrocardiac opacity most consistent with a left lower lobe pneumonia . There is a second opacity obscuring the right heart border consistent with a right middle lobe pneumonia . There is no evidence of pulmonary edema , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
Left lower lobe and right middle lobe pneumonia .