Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are within normal limits and without change . Lungs are clear except for a questionable well circumscribed nodular opacity in the right upper lobe , measuring 2 .1 cm in diameter , overlying the sixth right posterior rib with scapular overlay in this region limiting differentiation between a scapular and lung abnormality . Minimal blunting of left costophrenic sulcus may reflect small left pleural effusion and is without change since ___ .
    OUTPUT:
    
Questionable 2 cm diameter nodular opacity in periphery of right upper lobe . With only a single portable radiograph available , it is uncertain whether this is intrathoracic or a structure external to the patient . Recommend standard PA and lateral chest radiograph for confirmation and further localization . Dr . ___ has been telephoned to discuss this finding and recommendation on ___ at 8 :22 a .m . This communication occurred at the time of discovery .