::hangs head:: The truth is I don't know all the answers here (and I'm hesitant to bug my friend too much because I know she's getting more tests and is trying not to think too much about it in the interim. This is basically me trying to get more info/not freak out, without having to climb all over her about it and make it worse... :/ )

But to do my best...

As near as I can tell, she's only having this symptom in one hand, her left. I think she would have mentioned it if it had cropped up in the other hand. She mentioned a while back that she's dealt with diabetic neuropathy in her feet, but again, the neurologist seems to have ruled that out as a cause. Either way I doubt that they're manifesting anywhere nearly as noticeably, because when I posed diabetic neuropathy as a possibility, she was like "You know, I didn't even think of that..."

I'm sure the neuro did mention the specific nerves but my friend didn't tell me what they were. It's possible that the tests you mention are in the future.

As far as the repetitive strain injury -- I suppose that's possible. She works regularly at a computer, day to day, though it seems to me that would do more straining on the right hand than the left. I know carpal tunnel was also ruled out, along with the ulnar entrapment.

On the contrary, thanks for asking the questions (and putting up with my lack of info). If nothing else, it helps me realize there's a lot I don't know about the situation yet. I'm a worrier by nature, in a big way; I'm just trying to learn as much as I can so I can be reassuring rather than expend my worry at her.