Placenta membranacea
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placenta • Variation in placental morphology: diagrams - Ganzer Fall bei Radiopaedia
Placenta membranacea, also known as a placenta diffusa, is an extremely uncommon variation in placental morphology in which the placenta develops as a thin membranous structure occupying the entire periphery of the chorion.
Epidemiology
The estimated incidence is ~1:20,000-40,000 pregnancies .
Associations
- abnormal placental adherence: reported in up to 30% of cases
Pathology
In this situation all of the fetal membranes are covered by functioning villi and the placenta develops as a thin membranous structure occupying the entire periphery of the chorion. The placental mass can often be thin (1-2 cm ) and even disrupted.
Radiographic features
Antenatal ultrasound
May be seen as a placenta which circumferentially covers most (partial) or all (complete) of the entire uterine wall. May also show accompanying placental thinning and/or disruption.
Complications
Recognized complications include:
- accompanying placenta previa
- intra-uterine growth restriction (IUGR)
- recurrent antepartum hemorrhage
- second trimester miscarriages
- fetal demise
- postpartum complications
- postpartum hemorrhage
- retained placental tissue post delivery
Siehe auch:
- variation in placental morphology
- Intrauterine Wachstumsretardierung
- Fehlgeburt
- Entwicklungsanomalien der Plazenta
- Placenta praevia
- abnormal placental adherence
und weiter:
Assoziationen und Differentialdiagnosen zu Placenta membranacea:
variation in
placental morphology