Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left lower lobe opacity may represent pneumonia . Right basal atelectasis is mild . Bilateral effusions are unchanged . There is no pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen . Tracheostomy , left IJ venous line , and right subclavian Port - A - Cath are not significantly changed in position .
    OUTPUT:
    
Left lower lobe opacity may represent pneumonia .