Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Ill - defined hazy opacity in the superior segment of the left lower lobe is likely pneumonia . Right lower lobe atelectasis and pleural effusion are unchanged . The lungs are otherwise clear . No pneumothorax . Cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
Pneumonia in the superior segment of left lower lobe .