Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate mild subsegmental atelectasis in the right lung base with relatively low lung volumes , but no evidence of focal airspace consolidation , pneumothorax , pleural effusion , pulmonary edema . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .