Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs demonstrate low lung volumes . Relative to prior radiographs , cardiomediastinal and hilar contours appear not significantly changed . Heart size is within normal limits . There is no evidence of pleural effusion , pulmonary edema , or pneumothorax . Lungs are clear without a focal consolidation . Osseous structures demonstrate no acute abnormality . Imaged upper abdomen is unremarkable .
    OUTPUT:
    
No acute intrathoracic abnormality .