Imaging Case of the Week 208 Posted on June 6, 2016 by Prathibha The following chest x-rays show oesophageal foreign body at different levels. What are the 3 levels of oesophageal constrictions? How do you differentiate between a coin and a button battery on chest x-ray? Answer will be posted on 8/6/16. Share this:PrintEmailTwitterFacebookMoreRedditLinkedInPinterest