title: Ultrasound appearance of decidual reaction in the uterus during normal pregnancy.
abstract: The sonographic appearance of the decidual changes undergone by the uterus during normal pregnancy is described in 88 ultrasound examinations on 75 obstetrical patients. The relation of these decidual changes to the site of placental implantation and their preferential location in the posterior uterus suggests that they represent a combination of choriodecidual sinuses and prominent draining uterine veins. The decidual reaction is most prominent between 18 and 32 weeks with a decline near term. There is also a wide variation in the extent of decidual reaction during normal pregnancy preventing its use as a sensitive indicator of normal versus abnormal pregnancy.
mesh_terms: D003656:Decidua / Q000033:anatomy & histology / Q000098:blood supply; D010064:Embryo Implantation; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis; D012189:Retrospective Studies; D014463:Ultrasonography