Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation , effusion , or edema . There is a somewhat nodular opacity projecting over the left lung base and the anterior left sixth rib . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process . Somewhat nodular opacity projecting over the left lung base . This could represent superimposed shadows including nipple shadow however dedicated , repeat exam with nipple markers is suggested to further characterize .