The case of a boy with psychomotor retardation and dysmorphic features is presented. He has a 1.5 Mb 15q11.2 microdeletion of paternal origin diagnosed by aCGH. The deletion is located between breakpoints BP1 and BP2 of the Prader-Willi/Angelman syndromes critical region. Clinical features in our patient fit well with those described in ten cases of pure BP1-BP2 deletion published to date.
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