Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiograph demonstrates clear lungs bilaterally . There is no pleural effusion the are pneumothorax . Visualized osseous structures are without an acute abnormality . A chronic left rib deformity is present . Left humeral head degenerative changes noted , present on prior studies . Cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
No acute intrathoracic abnormality .