TY - CHAP M1 - Book, Section TI - PRENATAL DIAGNOSIS OF CEREBROSPINAL ANOMALIES A1 - Pilu, Gianluigi A2 - Fleischer, Arthur C. A2 - Toy, Eugene C. A2 - Lee, Wesley A2 - Manning, Frank A. A2 - Romero, Roberto J. Y1 - 2015 N1 - T2 - Sonography in Obstetrics and Gynecology: Principles & Practice, 7e AB - DefinitionsArnold-Chiari or Chiari type II malformation: cranial and cerebral anomalies arising as a part of the spectrum of open spina bifida.Closed spina bifida: a defect of the posterior vertebral arches covered by skin, frequently associated with subcutaneous cystic lesions.Dandy-Walker continuum: a spectrum of different posterior fossa anomalies that share in common an increased amount of fluid in the posterior fossa and/or an anomaly of position or morphology of the cerebellar vermis.Holoprosencephaly: a spectrum of cerebral anomalies that share in common an incomplete separation of the cerebral hemispheres.Open spina bifida: a defect of the posterior vertebral arches exposing the contents of the neural canal, usually associated with a posterior cystic lesion formed by the dysmorphic neural cord and meninges (myelomeningocele).Ventriculomegaly: enlargement of the lateral cerebral ventricles, usually defined by an internal diameter of the atrium of 10 mm or more. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/04/16 UR - obgyn.mhmedical.com/content.aspx?aid=1106706489 ER -