Figure 4.

(a) CT demonstrating a button battery lodged at the level of the thoracic inlet. Note the tiny focus of gas anteriorly. (b) Subsequent to removal, upper gastrointestinal contrast study of the same patient demonstrates a small diverticulum at the level of the previously impacted button battery. The patient underwent surgical repair. (c) A different patient with previous impaction of a button battery leading to tracheo-oesophageal fistula formation. The child underwent surgical repair, but required repeated post-operative tracheal dilatations for recurrent stricture formation, as demonstrated on this bronchogram.