Welcome to the boards!!
I think you are wise to question the diagnosis of and the tests for pseudotumor. As far as what can cause it, one cause is medications and 10 different kinds of medication (pain pills) are in this one category alone.
I don't know what your symptoms are, and I don't know what the intensity of your symptoms are, but I would SERIOUSLY question the need for a spinal tap and I would also SERIOUSLY question the risks involved of having a spinal tap and I would question what could be learned from a spinal tap, and what the accuracy of that diagnositic test is!!! If it can only diagnose 5 percent of the cases of a certain condition, and it poses a risk for ongoing headaches, for instance, I don't think I would have the procedure done!
Doctors do many, many unnecessary tests for several reasons:
1. They make lots of money doing these tests....it is a very lucrative business!
2. They're afraid of lawsuits should they miss something...overtesting "covers their b###s.
3. They get more patient referrals if they also refer...I'll pat your back, you can pat mine!
Here's a site that may provide some additional info: http://www.nlm.nih.gov/medlineplus/e...cle/000351.htm
In addition to doing some reading about the condition and about the testing/diagnosis, I would get another opinion before having an invasive procedure done.
Sorry if I sound like such a skeptic, but I've learned the hard way and the posts on these boards serve only to reinforce my opinions.