Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An endotracheal tube , enteric catheter , and left approach central venous line are in unchanged expected position . A left basilar opacity likely a combination of atelectasis and effusion has improved . The right basilar opacity is unchanged . Upper lungs remain clear . No new pulmonary edema is identified . There is no pneumothorax . Cervical thoracic spinal fusion hardware appears unchanged from prior .
    OUTPUT:
    
Improved aeration of the left lower lobe likely due to decreased pleural effusion .