How MRI imaging for an ovarian cyst led to diagnosis of short cervix

This case describes an unmeasurable cervix diagnosed incidentally during an MRI to characterize a large adnexal mass. In pregnancy, MRI can be a useful imaging modality to evaluate fetal anatomy, placental position and implantation, and abdominal and pelvic structures. In this case, evaluation of the uterus and cervix during imaging for an adnexal mass allowed for detection of an unmeasurable cervix and intervention with a rescue cerclage.