Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph demonstrates slightly lower lung volumes with increased prominence of the cardiac silhouette and bronchovascular crowding . Allowing for this and differences in technique , heart size is likely unchanged . There is increased opacity overlying the bilateral lower lobes , with evidence of a small left pleural effusion , consistent with mild pulmonary edema . A right pleural effusion is trace , if any . There is no pneumothorax . No definite focal consolidation is seen , though the presence of underlying consolidation at the left base would be difficult to exclude . Old healed right sided rib fractures again noted . Clips projecting over the left axilla are unchanged . The visualized upper abdomen is grossly unremarkable .
    OUTPUT:
    
1 . Mild to moderate cardiomegaly , grossly unchanged . 2 . CHF with interstitial and mild alveolar edema , with a small left pleural effusion and underlying left base collapse / consolidation .