title: Localization of the fetal conus medullaris by oblique view extended imaging.
abstract: OBJECTIVE
  To evaluate the accuracy of oblique view extended imaging (OVEI) in locating the position of the fetal conus medullaris.
  
  
  METHODS
  One hundred and twenty-two normal fetuses and five counterparts with spinal bifida received prenatal ultrasound examination. The vertebral body at the terminal of the conus medullaris and the coronal section of over five vertebral bodies were reconstructed using OVEI. Development of the nervous system of normal fetuses was assessed at postnatal day 28. For spinal bifida cases, pathological examination was performed.
  
  
  RESULTS
  Among 127 fetuses, the conus medullaris was accurately positioned in 120 (94.0%) cases according to OVEI. OVEI failed to locate the conus medullaris in three healthy fetuses due to obesity of the mother and four cases with spinal bifida due to abnormal fetal position. The conus medullaris was located at L3 or above in 115 healthy fetuses. The conus medullaris was positioned below L4 in five fetuses with spinal bifida, including L5 in two, S1 in two, and S3 in one, which was consistent with the findings of pathological examination.
  
  
  CONCLUSIONS
  OVEI can display the 12th rib, T12, and conus medullaris simultaneously. OVEI is applicable to precisely locate the position of the conus medullaris and useful for prenatal evaluation of spinal bifida.
authors.affiliation: Ultrasonic Department, The Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, No. 59 Xiangzhu Avenue, Nanning, 530002, Guangxi, China.
authors.forename: Shui-Hua
authors.initials: SH
authors.lastname: Yang
authors.affiliation: Ultrasonic Department, The Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, No. 59 Xiangzhu Avenue, Nanning, 530002, Guangxi, China.
authors.forename: Zuo-Jian
authors.initials: ZJ
authors.lastname: Yang
authors.affiliation: Ultrasonic Department, The Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, No. 59 Xiangzhu Avenue, Nanning, 530002, Guangxi, China.
authors.forename: Yuan-Yuan
authors.initials: YY
authors.lastname: Li
authors.affiliation: Ultrasonic Department, The Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, No. 59 Xiangzhu Avenue, Nanning, 530002, Guangxi, China.
authors.forename: Huan
authors.initials: H
authors.lastname: Huang
authors.affiliation: Ultrasonic Department, The Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, No. 59 Xiangzhu Avenue, Nanning, 530002, Guangxi, China. guangxiqvfuyou@163.com.
authors.forename: Xiao-Xian
authors.identifier: http://orcid.org/0000-0001-6701-2012
authors.initials: XX
authors.lastname: Tian
mesh_terms: D000328:Adult; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D013116:Spinal Cord / Q000000981:diagnostic imaging*; D016135:Spinal Dysraphism / Q000000981:diagnostic imaging; D013131:Spine / Q000000981:diagnostic imaging*; D018615:Ultrasonography, Doppler, Color; D016216:Ultrasonography, Prenatal / Q000379:methods*
keywords: Conus medullaris; Fetus; Oblique view extended imaging; Spinal bifida