664. Features of tension headache / Causes of subarachnoid hemorrhage / What % of the population has a berry aneurysm? / Diseases associated with berry aneurysm January 3rd, 2009 by reuben in .headache, SAH Back Top Tags: card 663. Cluster headache RFs, clinical features, ddx, Rx 665. What % headache patients have SAH? / S&Sx SAH / Hunt & Hess Classfication Leave a Reply Cancel reply Please post any discussion to the emupdates Reddit page.