IMAGE: PA and lateral chest XXXX, XXXX at XXXX hours. INDICATION: Preop for back surgery, XXXX. COMPARISON: XXXX, XXXX. FINDINGS: The lungs are clear. There is no pleural effusion. The heart is normal. There are atherosclerotic changes of the aorta. Senescent changes of the spine are seen. IMPRESSION: No acute pulmonary disease.