Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable chest radiograph was provided . There is a radiopaque foreign body projecting over the superior mediastinum measuring approximately 2 .6 x 1 .7 cm concerning for impacted foreign body within the upper esophagus . It s exact localization is difficult , given single frontal view provided . Lungs appear well aerated . Heart size is within normal limits . The aorta is calcified and unfolded . No bony abnormalities .
    OUTPUT:
    
Radiodense foreign body projecting over the superior mediastinum , which could reside within the upper esophagus , less likely trachea .