Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Left pleural effusion is unchanged compared to prior exam . No focal consolidation is seen however can not unequivocally exclude superimposed pneumonia . No pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Unchanged left pleural effusion . There is no focal consolidation however pneumonia can not be unequivocally excluded .