Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Semi-upright portable view of the chest demonstrates low lung volumes . The costophrenic angles are obscured , suggestive of trace pleural effusions . There is perihilar vascular congestion . Mediastinal silhouette is prominent . A large lucency projecting over cardiac silhouette , likely reflects patient 's known hiatal hernia . Heart size is difficult to assess . There is no pneumothorax . Coronary artery stents are in place . Sternotomy wires appear intact . Splenic artery calcifications are noted . Otherwise , partially imaged upper abdomen is unremarkable .
    OUTPUT:
    
Low lung volumes . Trace bilateral pleural effusions , perihilar vascular congestion . Large hiatal hernia .