[Risk from prenatal exposure to ionizing radiation].

Exposure to ionizing radiation during pregnancy always is a worrisome event. Knowledge of teratogenic and carcinogenic mechanisms based on reliable scientific data (ICRP 84) allows appropriate management of patients following exposure to ionizing radiation. Radiation exposure in the setting of diagnostic imaging studies is not associated with an increased risk of fetal malformation; however, the risk of childhood malignancy is minimally increased. This information must be provided to parents so they may reach an informed decision with regards to the outcome of the pregnancy. The analysis of the quality and quantity of exposure should be limited to imaging examinations where the abdomen was exposed. Management will be based on the type of exposure. Guidelines are provided for various exposure situations and all radiologists must be able to manage such situations.