Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right lower lung atelectasis has significantly improved . Right heart border is still indistinct with an unusual configuration . On the CT scan of ___ , there was some loculated pleural effusion in this area . There is possibly residual loculation in this area on today 's exam . The left lung is unremarkable . The patient had prior sternotomy for an ascending aortic repair . Tortuosity of the aorta is stable . There is no pneumothorax .
    OUTPUT:
    
There is still an unusual contour of the right heart border which could reflect residual loculated pleural effusion given the presence of loculated fluid in this region on prior CT .