From advanced imaging...where the source of severe acute headache is found in the sacrum.
Simmons
John D
JD
D000208:Acute Disease; D003560:Cysts / Q000209:etiology / Q000473:pathology*; D005260:Female; D050723:Fractures, Bone / Q000150:complications / Q000473:pathology; D006261:Headache / Q000209:etiology / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008588:Meningocele / Q000150:complications / Q000473:pathology*; D008875:Middle Aged; D011859:Radiography; D012447:Sacrum / Q000000981:diagnostic imaging / Q000293:injuries / Q000473:pathology