Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are provided . The right upper extremity PICC line is again seen with its tip residing in the low SVC . There are bilateral pleural effusions , small in size with mild compressive lower lung atelectasis . There is retrocardiac opacity which could also represent pneumonia , though overall findings appear improved from prior exam . The mid to upper lungs are well aerated . The heart size is normal . Mediastinal contour is unremarkable . Bony structures are intact .
    OUTPUT:
    
Small bilateral pleural effusions with retrocardiac opacity likely representing atelectasis , though can not exclude pneumonia . PICC line positioned appropriately .