title: Ruptured cerebral aneurysm associated with a persistent primitive trigeminal artery variant.
abstract: BACKGROUND
  Primitive trigeminal artery variants (PTAVs) are one of the rare persistent fetal anastomoses between the carotid and vertebrobasilar circulations. They originate from the internal carotid artery and join one of the cerebellar arteries instead of the basilar artery.
  
  
  METHODS
  We present an 82-year-old woman with subarachnoid hemorrhage due to a ruptured aneurysm originating at a PTAV. Three-dimensional computed tomography angiogram and cerebral angiography revealed bilateral PTAV and two aneurysms originating at the left PTAV. The proximal and distal aneurysms were saccular and fusiform, respectively. She underwent surgical treatment and her postoperative course was uneventful.
  
  
  CONCLUSIONS
  Our case demonstrates that extremely rare cerebral aneurysms associated with PTAV can be addressed successfully by surgical intervention.
authors: Department of Neurosurgery, Faculty of Life Sciences, Kumamoto University School of Medicine, 1-1-1, Honjo, Kumamoto 861-8556, Japan.
authors: Takahiro
authors: T
authors: Yamamoto
authors: Yu
authors: Y
authors: Hasegawa
authors: Yuki
authors: Y
authors: Ohmori
authors: Takayuki
authors: T
authors: Kawano
authors: Yutaka
authors: Y
authors: Kai
authors: Motohiro
authors: M
authors: Morioka
authors: Jun-Ichi
authors: J
authors: Kuratsu