A study was carried out to prospectively determine whether the apparent diffusion coefficients (ADC) calculated from MR images of the cervix are associated with preterm delivery in asymptomatic patients [1]. The patients had a sonographic cervical length of 15 mm or less and positive fetal fibronectin test results between 23 and 28 weeks of gestation. The results of the study show that MRI of the cervix is more accurate than ultrasound at predicting whether some women will have a preterm birth; cell density measurements derived from DWI results predicted which patients were at greater risk for impending preterm delivery. This article summarizes the findings.