Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to chest radiograph from the same day , triangular retrocardiac opacity has not substantially changed , more suggestive of left lower lobe atelectasis . Linear subsegmental atelectasis also has not substantially changed . Small left pleural effusion . Heart size is top normal . Right - sided PICC terminates in the low SVC . Dobhoff tube is only partially imaged below the diaphragm .
    OUTPUT:
    
Probable left lower atelectasis and small effusion .