Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , possible at the prior exam . Stable moderate cardiomegaly . Stable prominence of the hila , perhaps secondary to prominent hilar lymph nodes as seen on chest CT . Retrocardiac opacity is most likely atelectasis , similar to the prior exam . No focal consolidation , pulmonary edema , pneumothorax , or pleural effusion .
    OUTPUT:
    
1 . Low lung volumes and atelectasis . 2 . No definite pneumonia . Conventional PA and lateral chest radiograph could be a obtained to further evaluate .