Roughly 1 in 20 subarachnoid hemorrhages are missed during initial presentation in the emergency department – substantially increasing the risk of complications and mortality. That's scary. But is it a reason to do a lumbar puncture every time a patient's head hurts? EMRA*Cast host Will Smith (@WTSmithMD IG/Twitter) shares some expert insight from Lt. Col. Roderick Fontenette (@RodFontenette1).