Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An ET tube is present , tip 3 .8 cm above the carina . At present , the trachea appears midline . A right IJ central line tip overlies the mid / distal SVC . There are low inspiratory volumes . There is moderate to moderately severe cardiomegaly . Prominence of the mediastinum is noted , in keeping with findings on the prior film and likely accentuated by low lung volumes . Mild left greater right apical pleural thickening is unchanged . The apices are otherwise clear . There is slight upper zone redistribution and diffuse vascular blurring , suggesting mild interstitial edema . There is patchy opacity at the left lung base and the possibility of left lower lobe collapse and / or consolidation can not be excluded . The bulk of the left hemidiaphragm remains visible . Minimal blunting of the left costophrenic angle , but no gross effusion . Minimal atelectasis at the right base . Metallic density overlying the right side of the lumbar spine is consistent with known IVC filter , it incompletely evaluated on this study .
    OUTPUT:
    
1 . ET tube tip 3 .8 cm above the carina . Trachea in midline . 2 . Cardiomegaly and probable mild interstitial edema . 3 . Left lower lobe collapse and / or consolidation . Question small left effusion .