Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs through the chest demonstrate clear lungs bilaterally with low lung volumes . Cardiomediastinal and hilar contours are within normal limits . There is no pleural effusion or pneumothorax . Again noted is a left humeral head prosthesis .
    OUTPUT:
    
No acute intrathoracic abnormality .