Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior study , lung volumes are lower , causing mild bronchovascular crowding . There may be mild flattening of the bilateral hemidiaphragms , best appreciated on the lateral view . The heart size is top normal . Mediastinal and hilar contours are unremarkable . No focal consolidation , pleural effusion , or pneumothorax .
    OUTPUT:
    
No acute intrathoracic process .