Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low leading to increased prominence of the bronchovascular structures . Mild central vascular congestion is noted . Blunting of the left costophrenic angle may represent a trace pleural effusion . There is no lobar consolidation , pneumothorax , or overt pulmonary interstitial edema . The heart appears mild - moderately enlarged but is suboptimally imaged . No displaced rib fractures visualized .
    OUTPUT:
    
Low lung volumes with cardiomegaly and mild central pulmonary vascular congestion . No pneumothorax .