Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacities with hyperlucency identified at the lung bases , more conspicuous on the right than the left are likely due to scarring . The lungs are clear of consolidation . The cardiomediastinal silhouette is within normal limits . 1 of the 2 lateral views demonstrates an air - fluid level below the aortic arch potentially due to potentially within the esophagus . There is a right lateral indentation on the trachea at the thoracic inlet potentially due to a right - sided thyroid enlargement . No acute osseous abnormalities identified .
    OUTPUT:
    
Chronic changes particularly at the lung bases without definite acute cardiopulmonary process . Right lateral indentation on the trachea at the thoracic inlet that may be from right - sided thyroid enlargement and can be confirmed by thyroid ultrasound . Air-fluid level in the region of the esophagus seen on the lateral view .