Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiographs were obtained . There is no focal consolidation , pleural effusion , or pneumothorax . Again seen is left retrocardiac atelectasis , unchanged from prior exam . Cardiomediastinal silhouette is stable . Degenerative changes of the right shoulder joint are unchanged .
    OUTPUT:
    
No acute cardiopulmonary process .