Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Small left pleural effusion again noted , similar to the prior study . There is probable atelectasis at the left base , similar to the prior study . The left hemidiaphragm is elevated , though it is not clear how much of this is due to the diaphragm and high much due to the effusion . Minimal blunting of the right costophrenic angle is similar to the prior study .
    OUTPUT:
    
As above . .