Diastrophic dysplasia: A specific prenatal diagnosis by ultrasound

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Abstract
In a pregnant woman without increased genetic risk, the presence of distrophic dysplasia of the fetus was diagnosed sonographically at 31 weeks' gestation and definitively distinguished from other skeletal dysplasias. In all prenatal diagnoses of diastrophic dysplasia reported so far, this autosomal recessive congenital condition had occurred in the family's previous children and this made the diagnoses of fetal diastrophic dysplasia easier. The reported case was diagnosed due to evidence of an extreme shortening of all long bones of the extremities associated with other skeletal deformities which, taken as a whole, are typical of this syndrome: micrognathia, cervical kyphosis, persistent extension limitation in elbow and knee joints, club feet, ulnar diviation of hands, shortened phalanges, and, in particular, abduction of thumbs (‘hitchhiker thumbs’) and big toes.

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