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Levaillant, J.M. et al.

Levaillant, Gérard-Blanluet, Holder-Espinasse, Valat-Rigot, Devisme, Cavé, Manouvrier-Hanu,

Prenatal phenotypic overlap of Costello syndrome and severe Noonan syndrome by tri-dimensional ultrasonography.

BACKGROUND: Prenatal diagnosis of multiple congenital anomalies is difficult, and usually molecular biology cannot immediately confirm the suspected syndrome. Fetal dysmorphology is useful tool in the diagnosis process, with limitations. METHODS: We report the thorough prenatal investigation by 2D and 3D ultrasonography in a case of suspected Costello syndrome. RESULTS: Prenatal abnormalities were: increased nuchal translucency, polyhydramnios, bilateral pyelectasis and ventriculomegaly. Ultrasonographic morphological fetal face analysis found abnormal thickness of the skin in the prefrontal area, thick dysplastic ears, thick lips and deep-set creases in the hands and feet. As Costello and Noonan syndromes overlap, a PTPN11 analysis was done, with presence of a mutation (T854C). CONCLUSION: Prenatal overlap of feature of severe Noonan syndrome and Costello syndrome is confirmed, with dysmorphological similarities, due to edema of fetal skin in face and extremities.[1]

References

Prenatal phenotypic overlap of Costello syndrome and severe Noonan syndrome by tri-dimensional ultrasonography. Levaillant, J.M., Gérard-Blanluet, M., Holder-Espinasse, M., Valat-Rigot, A.S., Devisme, L., Cavé, H., Manouvrier-Hanu, S. Prenat. Diagn. (2006) [Pubmed]

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