Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs demonstrate clear lungs bilaterally . There are low lung volumes . Cardiac silhouette appears stable , the heart mildly enlarged . The right hemidiaphragm is elevated with associated atelectasis . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
When compared to prior study dated ___ , there has been little interval change . Low lung volumes and mild cardiomegaly persist . No acute intrathoracic abnormality is detected .