Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low leading to crowding of the bronchovascular structures . Mild prominence to the central pulmonary vasculature is similar as compared to ___ . No focal consolidation , large pleural effusion , or pneumothorax is identified . The patient is status post left mastectomy , and surgical clips overlie the left lung base . The cardiomediastinal silhouette is unchanged from the prior examination . A large hiatal hernia is noted .
    OUTPUT:
    
Low lung volumes and mild pulmonary vascular congestion . Large hiatal hernia . No discrete consolidation or pleural effusion .