Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to chest radiographs from ___ , there is little overall change . Lung volumes remain low . The right hemidiaphragm is persistently elevated . Mild cardiomegaly is stable compared to prior study . Mediastinal and hilar contours are stable . There is no focal consolidation , pleural effusion or pneumothorax . Several healed right rib fractures are noted .
    OUTPUT:
    
No acute intrathoracic process .