Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly is slightly smaller with unchanged calcification of the aortic knob . Compared with the prior radiograph , the pulmonary edema has improved , if not completely resolved . The severity of pulmonary vascular congestion is improved , with a persistent left pleural effusion . Greater opacification of the right lower lobe is apparent . However , prior episodes of asymmetric pulmonary edema have shown collection is specifically in the right lower lobe . Therefore while pneumonia can not be excluded , we do not have to invoke its presence to explain these findings . A fractured , undisplaced sternal wire is unchanged .
    OUTPUT:
    
1 . Improved pulmonary edema and pulmonary vascular congestion . 2 . Greater opacification of the right lower lobe correlates with prior episodes of asymmetric pulmonary edema in this region . Therefore , while pneumonia can not be excluded , this pattern can be used it explain these findings .