Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Multiple EKG leads overlie the right lower chest . Allowing for this , I doubt significant interval change . Again seen is upper zone redistribution , without overt CHF . Also again seen is patchy opacity in the right cardiophrenic region which could represent either focal atelectasis or a pneumonic infiltrate . The appearance is not significantly changed compared with ___ or ___ . Subsegmental atelectasis left lung base has increased . Minimal blunting the right costophrenic angle is unchanged . The left costophrenic sulcus is clear .
    OUTPUT:
    
Upper zone redistribution without overt CHF , similar to prior . Patchy opacity right cardiophrenic region is grossly unchanged . Differential includes atelectasis or focal infiltrate . New subsegmental atelectasis at the left base . The possibility of an early infiltrate at the left base would be difficult to exclude . No gross effusion . Minimal blunting right costophrenic angle .