Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A large retrocardiac opacity with an air - fluid level is seen on multiple prior examinations and is consistent with a known large hiatal hernia . Slightly increased left lower lobe consolidation and linear right middle lobe opacity , correspond with areas of atelectatic collapse seen on concurrent CT . There is no pneumothorax . No pulmonary edema or pleural effusions are evident . Mediastinal and hilar contours are within normal limits . Mild enlargement of the cardiac silhouette is unchanged from prior . A healed though persistently deformed left humeral head fracture is again noted .
    OUTPUT:
    
1 . Increased opacification of both lung bases corresponding to areas of atelectatic collapse seen on concurrent chest CT , please see report for details . 2 . Large hiatal hernia