A case of uterine incarceration with unrecognized uterine torsion

Fetal imagers are tasked with diagnosing complex fetal anomalies, but maternal abnormalities that may impact the pregnancy are also of utmost importance to recognize and report. Two rare obstetrical complications are uterine incarceration and torsion which can lead to increased maternal/perinatal mortality. Uterine incarceration occurs secondary to a retroverted uterus that becomes retroflexed and entrapped within the pelvis during the first trimester of pregnancy. Uterine torsion is rotation of more than 45° around its long axis. We report a rare case of an incarcerated uterus with presumed spontaneous resolution on follow-up MRI that was ultimately recognized to be uterine torsion at the time of delivery. Knowledge of these entities may help aid in timely detection and diagnosis of complex imaging presentations and avoid downstream complications.