Abstract

We report a boy with Desbuquois dysplasia type 1. He had the typical skeletal changes: a "Swedish key" appearance of the proximal femora; advanced carpal ossification and other distinctive features of the hand, including an extra-ossification center at the base of the proximal phalanx of the index and middle fingers; dislocation of the metacarpophalangeal joint of the index finger; and bifid distal phalanx of the thumb. In addition, he presented with very severe prenatal growth failure, respiratory distress as a neonate, subsequent failure to thrive and susceptibility to airway infection, and sudden death in early childhood. Molecular analysis identified homozygous 1 bp deletion in the Calcium-Activated Nucleotidase 1 gene (CANT1). To our knowledge, this is the first report of Desbuquois dysplasia type 1 in Japan. Our experience suggests potential lethality in the disorder.

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