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1 en 5000-7000


4:1 (m:h)


Según la trisomía de autosomas más frecuentes


Fr>Edad maternal avanzado


86% de aborto el neonato vive de 48-60 días ,40 horas ,18 meses.

Etimología

95% no disminución en meiosis II materna


5% mosaico


3% translocaciones recíprocas

Características

Retraso en CIU


Bajo peso poco grasa subcutánea


Dolicocefalia


Occipucio prominente


Micrognatia (Describe una mandíbula inferior es más pequeña de lo normal)


Orejas faunescas


Miembros superiores tienden a flexión


A tratamiento del pulgar con superposición de los otros dedos


Galones prominentes pies en mecedora