Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest were acquired . Hazy opacification of the left mid - to - lower lobe relates to overlying soft tissue and possible costochondral calcification , stable . The lungs are clear . The heart size is normal . There is redemonstration of a hiatal hernia . There are no pleural effusions . No pneumothorax is seen .
    OUTPUT:
    
No acute cardiac or pulmonary process .