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Keywords:

  • Array CGH;
  • phenotype;
  • prenatal;
  • prenatal BACs on beads;
  • Williams–Beuren critical region.

Key Clinical Message

Copy losses/gains of the Williams–Beuren syndrome (WBS) region cause neurodevelopmental disorders with variable expressivity. The WBS prenatal diagnosis cannot be easily performed by ultrasound because only few phenotypic features can be assessed. Three WBS and the first reciprocal duplication prenatal cases are described with a review of the literature.