shortened fetal femoral length
Shorted fetal femur is a morphological descriptor and is usually defined when the femoral length falls below the 5 centile for gestational age (some define it when it is under the 2.5 centile ) or less than 0.91 predicted by the bi-parietal diameter. It can occur in isolated or in association with a number of other anomalies.
According to the former definition (e.g. using the 5 centile), the estimated incidence is at 5% of pregnancies.
Recognized associations include
- aneuploidic syndromic
- non-aneuploidic syndromic
If detected in the 2 trimester, a careful search for any other fetal anomalies as well as a follows up scan later in the pregnancy is often recommended.
The prognosis can be variable depending on the presence of associated anomalies