Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . The lungs are well - expanded and clear without focal consolidation concerning for pneumonia . Pulmonary vasculature is within normal limits . A small density overlying the left posterior lateral rib 7 is noted . This may represent a nipple shadow , although a definite nipple shadow on the right side is not clearly visualized in the same location , which may be due to patient rotation .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Small density overlying left posterior lateral rib 7 .