Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right PICC ends in the mid SVC . Lung volumes remain low with small left pleural effusion and adjacent left basilar opacity . No right pleural effusion . No pneumothorax . Normal heart size and mediastinal contours .
    OUTPUT:
    
Stable small left pleural effusion with associated left lower lobe opacity likely reflecting atelectasis ; although , infection or aspiration is possible .