Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear with no evidence of consolidation , effusion , or pneumothorax . The cardiac silhouette remains mildly enlarged . Again identified is a 2 .4 x 2 .0 calcified round structure in the superior mediastinum corresponding with a calcified thyroid nodule on CT c - spine . Old left posterior seventh and eighth rib fractures are noted . There is , however , no evidence of acute fractures .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Calcified left thyroid nodule accounting for calcification in the superior mediastinum .