Disk battery lodged in the esophagus

An anteroposterior radiograph of an 8-month-old child with an opaque, circular object in the esophagus.
(A) The "halo" lucency along the edge of the circular object suggests that the item has a bilevel contour consistent with a battery. The radiolucent trachea and bronchi are to the side, and the orientation of the object suggests esophageal location.
(B) The lateral view also shows the bilevel contour of the object consistent with a battery.