Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . The lung volumes are significantly low , with patchy opacities in the right lung base which may represent either atelectasis or aspiration . Retrocardiac left basal atelectasis is noted . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
Heterogeneous right basal opacities may represent sequelae of aspiration or atelectasis . Recommended followup PA and lateral chest radiograph for further assessment .