Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lower lung volumes seen on the current exam . The lungs however remain clear without focal consolidation , effusion , or pneumothorax . Cardiomediastinal silhouette is within normal limits . Calcification in the region of the AP window is likely a calcified lymph node and possible subcarinal calcified lymph nodes are also identified . There is a posterior indentation of the trachea just below the thoracic inlet , potentially due to adjacent tortuous great vessels although enlarged thyroid would also be possible . Degenerative changes noted at the shoulders bilaterally . No acute osseous abnormality . There is no free intraperitoneal air .
    OUTPUT:
    
No acute cardiopulmonary process . Posterior displacement of the trachea just below the thoracic inlet potentially due to thyroid enlargement vs tortuous great vessels . Consider thyroid ultrasound to further characterize on a nonurgent basis .