title: Fetal scalp cyst or small meningocele: differential diagnosis with three-dimensional ultrasound.
abstract: BACKGROUND
  Prenatal differential diagnosis of fetal scalp cystic masses is challenging and mainly includes small meningoceles and epidermal cysts.
  
  
  METHODS
  A second-trimester anatomy scan revealed an extracranial cystic mass measuring 17 × 12 × 10 mm in the fetal occipital region. Three-dimensional datasets were obtained transabdominally and off-line analysis revealed a connection between the cyst and the subarachnoid space through a 5-mm skull defect. The diagnosis of a small meningocele was further confirmed by magnetic resonance imaging in the infant.
  
  
  CONCLUSIONS
  Prenatal three-dimensional ultrasound can be a useful adjunct in the prenatal differentiation between small meningoceles and epidermal cysts.
authors.affiliation: Department of Obstetrics and Gynecology, San Jose Hospital, University of Santiago de Chile, Santiago, Chile. fetalmed@yahoo.com
authors.forename: Waldo
authors.initials: W
authors.lastname: Sepulveda
authors.forename: Amy E
authors.initials: AE
authors.lastname: Wong
authors.forename: Sergio
authors.initials: S
authors.lastname: Sepulveda
authors.forename: Edgardo
authors.initials: E
authors.lastname: Corral
mesh_terms: D000328:Adult; D003560:Cysts / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D005260:Female; D005315:Fetal Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D021621:Imaging, Three-Dimensional; D007231:Infant, Newborn; D008297:Male; D008588:Meningocele / Q000000981:diagnostic imaging*; D012535:Scalp / Q000000981:diagnostic imaging*; D016216:Ultrasonography, Prenatal