Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild flattening of the diaphragm may be secondary to air trapping given the patient 's history of asthma . There is no pneumothorax , focal consolidation , or pleural effusion . The heart size is normal . The hilar and mediastinal contours are within normal limits .
    OUTPUT:
    
Hyperinflated lungs . No superimposed acute process .