Main Findings
In this prospective cohort study, we develop and validate a nomogram model to predict the probability of cesarean delivery for nulliparous women with suspected cephalopelvic disproportion based on six parameters: maternal BMI before labor, induction of labor (spontaneous / induced), bilateral femoral head distance, obstetric conjugate, fetal head circumference and fetal abdominal circumference. It is the first time combining maternal characteristics and MRI parameters as a practical tool to evaluate individual CPD risk in the nulliparous woman at term.