Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Semi-upright portable AP view of the chest was provided . Lungs are clear without definite signs of pneumonia or overt CHF . No large effusion or pneumothorax is seen . The heart size is normal . The mediastinal contour is unremarkable . The bony structures are intact .
    OUTPUT:
    
No acute intrathoracic process .