title: A possible behavioural and cognitive phenotype for the 47,XYY karyotype in a pre-pubertal child.
abstract: OBJECTIVE
  The aim of this study was to describe the case of a 9-year-old boy with 47,XYY genotype and possible behavioural phenotype involving 'internalizing' and 'externalizing' symptoms and cognitive phenotype of deficient spatial memory.
  
  
  CONCLUSIONS
  Longitudinal study of 47,XYY cases recognized prenatally are needed to confirm the preliminary findings described in this report.
authors.affiliation: Academic Child Psychiatry Unit, Department of Paediatrics, University of Melbourne, Royal Children's Hospital, Murdoch Children's Research Institute, Parkville, Vic, Australia.
authors.forename: Chris
authors.initials: C
authors.lastname: Davey
authors.forename: Alasdair
authors.initials: A
authors.lastname: Vance
mesh_terms: D002648:Child; D002653:Child Behavior Disorders / Q000175:diagnosis / Q000235:genetics*; D003072:Cognition Disorders / Q000175:diagnosis / Q000235:genetics*; D005838:Genotype; D006801:Humans; D008297:Male; D008569:Memory Disorders / Q000175:diagnosis / Q000235:genetics; D009483:Neuropsychological Tests; D010641:Phenotype; D012720:Severity of Illness Index; D014997:XYY Karyotype