I did not get a report from Univ of PA possibly because my results were negative. I spent 4 days at Mayo in MN and they could not come up with an answer. I also went to Johns Hopkins in Baltimore, they could not come up with a cause. None of my relatives have PN. Over the years it was mildly suggested by various neurologists that my PN could possibly be genetic related, could be related to back issues, could be caused by toxins or even medications. So, the word idiopathic became the label. After all, we have to call it something.