What's fun about medicine is that you're constantly learning. In this week's New England Journal of Medicine (NEJM), there's a little photo (and video if you're online) of a lesion in someone's hear. The person was a 50-year-old woman who complained of some ear ringing (tinnitus) that was pulsatile.
Wouldn't you know it? It's glomus tympanicum. Sorry, but I don't remember learning about this in medical school. You won't find any information on Wikipedia either, so you'll have to do some traditional research to learn about it.