Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiographs were obtained . There is mild bronchovascular crowding and left basilar atelectasis likely related to low lung volumes . The cardiomediastinal silhouette is stable . There is no pleural effusion or pneumothorax . Medial left base retrocardiac density corresponds to known hiatal hernia , similar in appearance compared to prior study . There are chronic degenerative changes of bilateral glenohumeral joints . An old sternal fracture is again noted .
    OUTPUT:
    
No acute cardiopulmonary process .