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A note on Medcyclopedia
Medcyclopedia requires users to
register in order to use some features. In order to ensure that only medical professionals may do so, they require registrants to identify the aortic lumen in a (tiny) CT slice of the upper abdomen by clicking on it. If you are using Firefox this is fairly easy to do whether you know what you're looking at or not, as Firefox will only allow you to click on the aortic lumen. If you're using Internet Explorer, you have to have a slightly better idea what you're looking at, but don't worry: you can find the the answer they're looking for
here in a learning activity they've conviently provided.