Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable supine view of the chest demonstrates low lung volumes , which accentuates bronchovascular markings . There is no pleural effusion , focal consolidation or pneumothorax . Hilar and mediastinal silhouettes are unremarkable . Heart size is top normal . Endotracheal tube terminates 4 cm above the carina . The patient 's known sternal and rib fractures are better seen on the CT exam of same date .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .