Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . 7 mm right apical dense nodule corresponds to a benign sclerotic exophytic bone lesion of the posterior fourth rib . There is no pneumothorax or pleural effusion . Mediastinal and cardiac contours are normal .
    OUTPUT:
    
There is no evidence of active or latent tuberculosis .