Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of chest were obtained . A left arm PICC line is again seen with tip residing in the region of the superior vena cava . Improved aeration in the lungs is noted compared with prior exam , though there is persistent small right pleural effusion and areas of subsegmental atelectasis . A retrocardiac density could represent left lower lobe consolidation , though this is not clearly assessed on the lateral view . Mediastinal contour is stable . No pneumothorax .
    OUTPUT:
    
Small right effusion and scattered lower lung atelectasis . Retrocardiac opacity could represent atelectasis versus pneumonia .