Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right apical opacity is not significantly changed from prior exam , and most consistent with the known right apical lung nodule . The lungs are otherwise clear without consolidation or edema . There is no pleural effusion or pneumothorax . A small amount of pneumomediastinum is present , which is not unexpected post-operatively . The cardiomediastinal silhouette is otherwise normal .
    OUTPUT:
    
1 . Small amount of pneumomediastinum , which is not unexpected post-operatively . 2 . Stable appearance of the right upper lobe nodule , better evaluated on the recent PET - CT .