Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Relatively low lung volumes are noted . Streaky retrocardiac opacity is noted , potentially atelectasis . Median sternotomy wires are identified . Cervical and lumbar spine fixation hardware is partially imaged . No acute osseous abnormalities .
    OUTPUT:
    
Left basilar opacity , potentially atelectasis with infection not excluded .