Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a round density measuring approximately 1 cm projecting over the left mid lung , which was not visualized on the prior radiograph in ___ . The lungs are otherwise clear . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Nodular density in the left midlung measuring approximately 1 cm , not visualized on prior radiograph .