As a working tech, I'll get to see a variety of interesting x-ray images, and I hope to collect some of them for discussion purposes. This will give me an opportunity to study them in more detail and share them with you as well.

Recently, I was working with a student on a chest x-ray when we stumbled upon this rather intriguing image.  In my limited experience, I have never seen a hiatal (or hiatus) hernia this large.  In this x-ray, it's very well-definied by the air-fluid level present. 

What is a hiatal hernia?

Wikipedia has a nice entry on the Hiatus Hernia if you want to take a look at it there, but a hiatal hernia is a condition where a portion of the stomach protrudes into the chest cavity through the diaphragm.