On the science/science fiction site I09, there is a story about the Throckmorton Sign. In clinical radiological terms, it is the shadow of the penis that sometimes shows up on x-rays. Frequently, the member points towards a hip injury. This is more out of positioning to favor the injured hip than any diagnostic powers of the penis.
I was doubly amused by this because one of the characters in Camp Arcanum is named Throckmorton. He is a police detective who pursues a decade-long homicide investigation of the big-bad and makes life difficult for my heroine Brenwyn. Looking at it from her point of view, he was something of a dick, though not highly diagnostic.
If you would like to see the article yourself, follow the link below. It is mildly NSFW due to radiological penis shadows.