Nomogram of the width, length, and area of the fetal optic chiasm according to gestational week

Abstract Objective Using transabdominal 2D ultrasonography, we aimed to establish nomograms for fetal optic chiasm (OC) width, length, and area between 16–37 weeks of gestation. Materials and Methods OC measurements were performed by a resident and a perinatologist. An agreement was evaluated using intraclass correlation coefficients (ICCs) with 95% confidence intervals. Then, nomogram tables of OC width, length, and area measurements were derived using these measurements. Results A strong positive correlation was found between OC measurements and gestational week (GW) (r=0.873 for width, r=0.827 for length, r=0…