Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph was obtained . The lungs are relatively well expanded and clear . Linear atelectasis is seen in the left lower lobe . There is no focal consolidation , pleural effusion or pneumothorax . Left subclavian catheter has been removed . The heart is moderately enlarged with tortuous aortic contour .
    OUTPUT:
    
No acute intrathoracic process .