Isolated Short Femur Length in the Third Trimester

Femur length (FL) is one of the three key biometric parameters routinely measured via ultrasound during prenatal visits to determine fetal gestational age and growth. A short FL is generally defined as a value that is two standard deviations below the mean FL for a particular gestational age. The etiology of short FL includes skeletal dysplasias, aneuploidies, and intrauterine growth restriction. We present a case of a pregnant patient with isolated short FL of fetus on third trimester ultrasound exam.