Bilobed placenta
Updates to Article Attributes
A bilobed placenta (or, also referred as bipartite placenta), is avariation in placental morphologyand and refers a placenta seperatedseparated into two near equal lobes. If more than two lobes are present, it is termed a trilobed, four lobed-lobed and so on.
Epidemiology
The estimated incidence is at up to ~4% of pregnancies.
Pathology
It is thought to result from localised atrophy as a result of poor dedicualisation or vascularisation of a part fo the uterus (dynamic placentation theory) 5.
Associations
Radiographic features
Antenatal ultrasound
May be sonographically seen as two seprateseparate placental discs of nearnearly equal size. The cord usually attaches to a thin connecting rim of chorionic tissue which bridges the two lobes. Less commonly the cord may insert into one of the lobes.
Complications
- it carries an increased incidence of type II vasa previa
- it may increase the incidence of postpartum haemorrhage due to retained placental tissue
Differential diagnosis
If more than one lobe of placenta is seen in an antenatal scan consider:
- succenturiate lobe: accessory lobe(s) much smaller in size
- twin pregnancy with two placentas
-<p>A <strong>bilobed placenta</strong> (or <strong>bipartite placenta</strong>) is a <a href="/articles/variation-in-placental-morphology">variation in placental morphology </a>and refers a placenta seperated into two <strong>near equal</strong> lobes. If more than two lobes are present it is termed a trilobed, four lobed and so on.</p><h4>Epidemiology</h4><p>The estimated incidence is at up to ~4% of pregnancies.</p><h4>Pathology</h4><p>It is thought to result from localised atrophy as result of poor dedicualisation or vascularisation of a part fo the uterus (dynamic placentation theory) <sup>5</sup>.</p><h5>Associations</h5><ul><li><a href="/articles/velamentous-insertion-of-the-cord">velamentous insertion of the cord</a></li></ul><h4>Radiographic features</h4><h5>Antenatal ultrasound</h5><p>May be sonographically seen as two seprate placental discs of near equal size. The cord usually attaches to a thin connecting rim of chorionic tissue which bridges the two lobes. Less commonly the cord may insert into one of the lobes.</p><h4>Complications</h4><ul>- +<p>A <strong>bilobed placenta</strong>, also referred as <strong>bipartite placenta</strong>, is a <a href="/articles/variation-in-placental-morphology">variation in placental morphology</a> and refers a placenta separated into two <strong>near equal</strong> lobes. If more than two lobes are present, it is termed a trilobed, four-lobed and so on.</p><h4>Epidemiology</h4><p>The estimated incidence is at up to ~4% of pregnancies.</p><h4>Pathology</h4><p>It is thought to result from localised atrophy as a result of poor dedicualisation or vascularisation of a part fo the uterus (dynamic placentation theory) <sup>5</sup>.</p><h5>Associations</h5><ul><li><a href="/articles/velamentous-insertion-of-the-cord">velamentous insertion of the cord</a></li></ul><h4>Radiographic features</h4><h5>Antenatal ultrasound</h5><p>May be sonographically seen as two separate placental discs of nearly equal size. The cord usually attaches to a thin connecting rim of chorionic tissue which bridges the two lobes. Less commonly the cord may insert into one of the lobes.</p><h4>Complications</h4><ul>
-<a href="/articles/multifetal-pregnancy-1">twin pregnancy</a> with two placentas</li>- +<a href="/articles/twin-pregnancy-1">twin pregnancy</a> with two placentas</li>
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