Aplastic or Twig-Like Middle Cerebral Artery Presenting with Intracerebral Hemorrhage During Pregnancy: Report of Two Cases oleh Yudai Goto, Hideki Oka, Shiho Hiraizumi, Takanari Okamoto, Sho Nishii, Hiroyuki Yamamoto, Takumi Yamanaka, Masataka Nanto, Naoto Shiomi, Akihiko Hino, Naoya Hashimoto