title: Vasa previa evaluated by noncontrast time-of-flight magnetic resonance angiography.
abstract: OBJECTIVE
  Vasa previa is a rare complication, and rupture of vasa previa during pregnancy may lead to significant perinatal mortality. Here, we report a case of vasa previa evaluated prenatally using noncontrast time-of-flight magnetic resonance angiography (TOF MRA).
  
  
  METHODS
  A 22-year-old primiparous woman was referred to our hospital due to suspicion of vasa previa. Transvaginal ultrasonography showed two vessels running over the internal os. To obtain further information, magnetic resonance imaging (MRI) and TOF MRA were performed. Caesarean section was carried out, and macroscopic findings of the vascular distribution on the fetal membrane were consistent with those identified by TOF MRA.
  
  
  CONCLUSIONS
  TOF MRA in addition to MRI may be an option for prenatal identification of the precise three-dimensional vascular distribution in patients with vasa previa.
authors: Department of Obstetrics and Gynecology, Wakayama Medical University, Wakayama, Japan. Electronic address: naoyuki@wakayama-med.ac.jp.
authors: Naoyuki
authors: N
authors: Iwahashi
authors: Department of Obstetrics and Gynecology, Wakayama Medical University, Wakayama, Japan.
authors: Nami
authors: N
authors: Ota
authors: Department of Obstetrics and Gynecology, Wakayama Medical University, Wakayama, Japan.
authors: Michihisa
authors: M
authors: Shiro
authors: Department of Obstetrics and Gynecology, Wakayama Medical University, Wakayama, Japan.
authors: Shigetaka
authors: S
authors: Yagi
authors: Department of Obstetrics and Gynecology, Wakayama Medical University, Wakayama, Japan.
authors: Sawako
authors: S
authors: Minami
authors: Department of Obstetrics and Gynecology, Wakayama Medical University, Wakayama, Japan.
authors: Kazuhiko
authors: K
authors: Ino
mesh_terms: D005260:Female; D006801:Humans; D018810:Magnetic Resonance Angiography / Q000379:methods*; D011247:Pregnancy; D016216:Ultrasonography, Prenatal / Q000379:methods; D055949:Vasa Previa / Q000000981:diagnostic imaging*; D055815:Young Adult
keywords: magnetic resonance angiography; magnetic resonance imaging; vasa previa