Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a nodular density projecting over the left mid lung which suggests a nipple shadow . Lung fields appear otherwise clear , the cardiomediastinal silhouette and hila are normal . There is no pleural effusion and no pneumothorax .
    OUTPUT:
    
No acute cardiothoracic process . Probably nipple shadow projecting over the left mid lung ; when clinically appropriate , confirmation with an additional PA view using nipple markers is recommended .