Fig. 2: Ultrasound of the fetus with de novo MN1 variant.

The fetus showed in the 21st gestational week-long bone length under the 3rd percentile (A: femur, 29,3 mm) without any other skeletal abnormalities. During the further course of pregnancy, there have been no other malformation or abnormalities of the skeleton identified (thorax (B) and profile (C) considered as normal; 21st gestational week).