Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There relatively low lung volumes . Given this , no definite focal consolidation is seen . The be difficult to exclude a trace left pleural effusion . Cardiac and mediastinal silhouettes are grossly unremarkable . No overt pulmonary edema is seen . No evidence of pneumothorax is seen .
    OUTPUT:
    
No definite focal consolidation to suggest pneumonia . Difficult to exclude trace left pleural effusion .