Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: 2 views were obtained of the chest . The location of the previously described opacities have not been provided . Within this limitation , the lungs appear hyperexpanded but clear . There is no pleural effusion or pneumothorax . The heart and mediastinal contours are unremarkable . Old left upper rib irregularities may reflect fractures .
    OUTPUT:
    
No acute intrathoracic process .