Imaging of acute abdomen in pregnancy.

The approach to imaging in pregnancy is unique, as it is essential to minimize radiation exposure to the fetus. Ultrasonography and magnetic resonance imaging are the chief modalities for evaluation of the pregnant patient with abdominal pain. Use of computed tomography should not be delayed when there is a need for early diagnosis. This article discusses test selection and underlying reasoning, with a description of common imaging features of different causes of acute abdominal pain in pregnancy. Also discussed are current evidence-based recommendations for the use of iodinated and gadolinium-based contrast agents and the importance of patient counseling.