Introduction:

Schaaf Yang Syndrome (SHFYNG) is a multisystemic disorder characterized by a group of signs and symptoms related to genetic, congenital, and multivariate clinical alterations. It was first described by Dr. Schaaf and Dr. Yaping, professors of Molecular and Human Genetics at the University of Houston and Baylor, respectively, in 2013 (1). SHFYNG has an autosomal dominant inheritance with a mutation located in the paternal allele, since the MAGEL2 gene has a maternal imprint and only the paternal allele is expressed. Unlike other classic autosomal dominant pathologies, SHFYNG syndrome can skip several generations, as long as the mutation resides on the maternal chromosome.

Presentation of the case:

Female preschooler, with a history of stay in the Neonatal Intensive Care Unit, due to neonatal hypotonia and poor suction, bronchitis, and pneumonia. Her phenotype is distinguished by hypotonic facies, prominent forehead, internal epican-thus, prominent cheekbones, low nasal bridge, broad nose, thin upper lip, winged ears, short neck, and central obesity.

She presents neurodevelopmental, language, and psychomotor delay. Genetic studies: 46,XX karyotype, comparative genomic hybridization: normal genomic pattern, female sex, trio exam a pathogenic variant c.1996dupC (p.Gln666Profs*47) in the MAGEL2 gene associated with SHFYNG syndrome.

Conclusion:

It is reported to be the first national report of this syndrome, with a very low worldwide incidence, estimating approximately <1 / 1,000,000 live births, which allows us to expand knowledge and suspect difficult-to-diagnose pathologies like this one.

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