Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates a borderline enlarged cardiac silhouette . The central pulmonary vasculature is indistinct . There is no focal consolidation . There is no definite pleural effusion or pneumothorax . Midline sternal wires are well aligned and intact .
    OUTPUT:
    
Mild pulmonary vascular congestion without evidence of pulmonary edema . .