Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . The lungs are clear of focal consolidation , effusion , or edema . Rounded opacity projects between the anterior left sixth and seventh ribs overlying the left heart border which may be a nipple shadow . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormality is identified .
    OUTPUT:
    
No definite acute cardiopulmonary process . Nodular opacity projecting over the left lung base likely a nipple shadow , but repeat exam with nipple markers in place suggested to confirm .