Items tagged “placenta”

24 results found
Article

Uteroplacental blood flow assessment

Uteroplacental blood flow assessment is an important part of fetal well-being assessment and evaluates Doppler flow in the uterine arteries and rarely the ovarian arteries. Pathology In a non-gravid state and at the very start of pregnancy the flow in the uterine artery is of high pulsatility ...
Article

Circumvallate placenta

Circumvallate placenta refers to a variation in placental morphology in which, as a result of a small chorionic plate, the amnion and chorion fetal membranes ‘double back’ around the edge of the placenta. Epidemiology The prevalance is estimated to be at around 1-7% 3. Pathology There is inw...
Article

Placental chorioangioma

Placental chorioangiomas are benign vascular tumours of placental origin. It is the most common tumour of the placenta and is usually found incidentally. Epidemiology The estimated incidence is at ~1% of all pregnancies 3. Clinical presentation In most cases, chorioangiomas are asymptomatic,...
Case

Placenta praevia

 Diagnosis certain
Radswiki
Published 20 Oct 2010
74% complete
MRI
Article

Placenta praevia

Placenta praevia is a term given to an abnormally low position of the placenta such that it lies close to, or covers the internal cervical os.  It is a potentially life-threatening condition to both mother and infant, which may result in exsanguination. As such, antenatal diagnosis is essential...
Article

Placental abruption

Placental abruption refers to a premature separation of the normally implanted placenta after the 20th week of gestation and before the 3rd stage of labour. It is a potentially fatal complication of pregnancy and is a significant cause of third-trimester bleeding / antepartum haemorrhage. Epide...
Article

Vasa praevia

Vasa praevia is a term given when there are abnormal fetal vessels within the amniotic membranes that either cross or run in extremely close proximity to the internal cervical os. Pathology Vasa previa can be of two types type I (present in ~ 90% of cases with vasa praevia 3): abnormal fetal ...
Article

Succenturiate lobe

A succenturiate lobe is a variation in placental morphology and refers to a smaller accessory placental lobe that is separate to the main disc of the placenta. There can be more than one succenturiate lobe. Epidemiology The estimated incidence is ~2 per 1000 pregnancies. Radiographic features...
Article

Variation in placental morphology

There can be several variations in placental morphology. These include: single lobed discoid placenta (single disc): most common scenario bilobed placenta: two near equal size lobes succenturiate lobe(s): one of more smaller accessory lobes circumvallate placenta: rolled placental edges with...
Article

Placenta accreta

Placenta accreta (PA) is both the general term applied to the abnormal placental adherence and also the condition seen at the milder end of the spectrum of abnormal placental adherence. This article focuses on the second, more specific definition. In a placenta accreta, the placental villi exte...
Article

Differential diagnosis for bleeding in pregnancy

Uterine bleeding during pregnancy is a common clinical presentation that often necessitates obstetric ultrasound for the assessment of the haemorrhage, and of fetal well being. The potential causes vary with the stage of gestation. Bleeding in the first trimester miscarriage threatened misca...
Case

Succenturiate lobe of placenta

 Diagnosis almost certain
Dr Alexandra Stanislavsky
Published 12 Apr 2011
75% complete
Ultrasound
Article

Placental venous lakes

Placental venous lakes refer to a phenomenon of formation of hypoechoic cystic spaces centrally within the placenta. Finding placental lakes during a second trimester ultrasound scan is not associated with any uteroplacental complication or with an adverse pregnancy outcome. They can, however, b...
Article

Velamentous cord insertion

Velamentous cord insertion is one of the types of abnormal umbilical cord insertion into the placenta. Epidemiology The estimated incidence is ~1% in singleton and 9-15% in twin pregnancies, respectively 11. It is also more common in placenta previa than in normally located placentas. The prev...
Article

Marginal cord insertion

Marginal cord insertion is a type of abnormal cord insertion. Epidemiology The estimated incidence is at ~7% 1 of singleton pregnancies but ~25% of twin pregnancies. Hence, it is very important to locate the umbilical cord in all patients, particularly in high risk pregnancy. Pathology In th...
Article

Placenta increta

Placenta increta is an intermediate level in the spectrum of abnormal placental villous implantation and accounts for ~20% of such cases. The placental villi extend beyond the confines of the endometrium and invades the myometrium.  Epidemiology The estimated incidence is increasing (presumabl...
Case

Placental abruption

 Diagnosis almost certain
Dr Andrew Dixon
Published 12 Jul 2011
66% complete
Ultrasound
Case

Placenta praevia and accreta

 Diagnosis almost certain
Dr Hani Salam
Published 20 Jul 2011
77% complete
MRI
Case

Vasa previa

 Diagnosis almost certain
Dr Maulik S Patel
Published 10 Feb 2013
72% complete
Ultrasound
Article

Placenta

The placenta is a fetal organ of pregnancy, responsible for providing nutrition and oxygen to the fetus as well as excretory functions. Ultrasound is the first-line modality for imaging the placenta, but MRI may be indicated if an abnormality is suspected.  Embryology Placenta is formed by fet...

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