In cases of FGR, which measurement is least likely to be affected?

In the context of fetal growth restriction (FGR), transcerebellar diameter is often the measurement least affected. This is because the transcerebellar diameter reflects the size of the cerebellum, which is less influenced by nutrient supply and growth conditions that affect other parts of the fetus.

Head circumference, abdominal circumference, and femur length can be significantly impacted in cases of FGR. The abdominal circumference is particularly indicative of overall fetal growth and can show reductions when there is a restriction in growth due to placental insufficiency or other factors. Femur length is also typically affected because long bones can reflect nutritional status and overall growth patterns. Head circumference is impacted as well since brain sparing can occur and its growth may follow a trend differently compared to somatic growth metrics.

In contrast, while the transcerebellar diameter may show variation, it is generally more stable in instances of FGR compared to other measurements, making it a less affected parameter in this clinical scenario. This relative stability underscores the role of the cerebellum and its growth patterns during fetal development, even in the face of restricted overall growth.