Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest PA and lateral radiograph demonstrates unremarkable mediastinal , hilar and cardiac contours . Comparatively decreased bilateral lung volumes with appearance of vascular crowding in the lung bases . Otherwise , lungs are clear . No overt pulmonary edema . No pleural effusion or pneumothorax .
    OUTPUT:
    
No acute intrathoracic process .