Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta is mildly tortuous and demonstrates mild atherosclerotic calcifications . Mediastinal contours are otherwise unchanged . Hilar contours are normal . There is no pulmonary vascular congestion . No focal consolidation , pleural effusion or pneumothorax is seen . Streaky opacities within the left lung base may reflect areas of atelectasis or scarring . T7 through T11 fusion hardware is unchanged with similar appearance of the compression fracture of the T9 vertebral body .
    OUTPUT:
    
Streaky left basilar opacity , likely atelectasis or scarring .