Prenatal ultrasonographic approach to skeletal dysplasia: Practical tips
What is the ideal time to look for the skeletal dysplasia? The long bones, vertebrae and calvarium begin ossifying by 12 weeks, so the presence of certain skeletal dysplasias especially the lethal ones can be suggested as early as the first trimester. When should we suspect for skeletal dysplasia? Any fetus showing femoral length (FL) or humerus length (HL) measurements less than 5th centile or −2 SD from the mean at all gestations should be evaluated. Table 1: Checklist to approach to the skeletal dysplasias. Gestational age based on LMP or first trimesterultrasound.
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