Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were reviewed and compared to the prior studies . The lungs are clear without focal consolidation , pulmonary edema , pleural effusion or pneumothorax . The heart size is normal and a tortuous calcified aorta is unchanged .
    OUTPUT:
    
No acute cardiopulmonary process or findings to explain the patient 's back pain .