Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: 7 mm well circumscribed rounded opacity projecting below the ___ posterior rib . This was not seen on chest CT ___ . This was not seen Atrial ventricular pacemaker is seen with leads terminating in the right atrium and right ventricle . There is no pneumothorax or pulmonary edema . Normal lung volumes . No pneumonia . Cardiomediastinal and hilar structures are normal .
    OUTPUT:
    
Possible lung nodule in the left upper zones of the lung . Chest CT is recommended . Pacemaker leads in appropriate position without evidence of pulmonary edema or pneumothorax .