Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No focal consolidation is seen . There is slight blunting of the left posterior costophrenic angle which may be due to pleural thickening ; however , a small pleural effusion is not excluded . There is no pneumothorax . There is no overt pulmonary edema . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Slight blunting of the posterior left costophrenic angle may be due to pleural thickening or a trace pleural effusion .