Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A nodular opacity in the interspace between the anterior first and second right ribs is ill - defined . There is no pleural effusion or pneumothorax . The heart size is normal . The aortic knob is calcified .
    OUTPUT:
    
A nodular opacity in the interspace between the anterior first and second right ribs is ill - defined . Shallow obliques are recommended .