title: [Sonographic changes in placental structure during pregnancy].
abstract: Modern ultrasonic-B-scanners permit the in-vivo-observation of placental structure during pregnancy. From 3rd Trimenon there are characteristic ultrasonic patterns point to placental maturity with classification grades from 0 to III. Progressive echographic changes begin in the chorionic plate, after that few scattered in the placental substance and finally in different extent and density in the basal layer. Grade III represent the term placenta. In the determination of intrauterine growth retardation and dysmaturity the recognition of structure may be an additional indication and should be a part of ultrasonic routine care.
mesh_terms: D002114:Calcinosis / Q000473:pathology; D005260:Female; D005865:Gestational Age; D006801:Humans; D007238:Infarction / Q000473:pathology; D010920:Placenta / Q000098:blood supply / Q000473:pathology*; D011247:Pregnancy; D014463:Ultrasonography / Q000379:methods*
vernacular_title: Sonographische Veränderungen der Plazentastruktur im Schwangerschaftsverlauf.