ATRX and Hoyeraal-Hreidarsson syndrome: It is known that mutations in the DKC1 and ATRX genes might cause microcephaly (in the case of DKC1 seen in the Hoyeraal-Hreidarsson Syndrome variant only), so characteristic for mutations in WDR62, nevertheless the open question is whether what we have here is the real dual or triple molecular diagnosis.