Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Rounded 1 cm x 1 cm opacity projecting in the right upper lung may be external to patient and is not seen on prior radiograph . Lungs are otherwise clear and pleural surfaces are normal . Heart size , mediastinal contour and hila are normal .
    OUTPUT:
    
1 . No radiographic evidence of pneumonia . 2 . Rounded opacity projecting in the right upper lobe may be external to patient . Consider repeat PA or shallow oblique radiographs without patient 's garments for better characterization . Results were entered into critical results by Dr .___ on ___ to be conveyed to the referring physician .