Placentomegaly
Updates to Article Attributes
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was changed:
Placentomegaly is a term applied to an abnormally enlarged placenta.
Pathology
Associations
It can be associated with a number of maternal and fetal disorders which include:
- maternal
- maternal anaemia(s)
- maternal diabetes
- chronic intrauterine infections
- alpha-thalassemia
- fetal
- umbilical vein obstruction
- fetal high output failure
- fetal malformation
- Beckwith-Wiedemann syndrome 1,5
- sacrococcygeal teratoma
- hydrops fetalis and causative underlying conditions
-
chromosomal anomalies
- triploid: with an extra set from paternal origin
- in utero infection 8
-
Finnish type congenital nephrotic syndrome 6
- fetomaternal haemorrhage
- placental abnormalities
Radiographic features
Antenatal ultrasound
May show an increase in placental thickness and/or placental extent. The increase in size may be homo or heterogeneous dependent on the cause. The maximum thickness considered normal at any stage in pregnancy is often taken at 4 cm.
Differential diagnosis
The differential for an apparent increased in placental size on ultrasound includes:
- retroplacental haematoma: especially when it is isoechoic, e.g. from a placental abruption
-<p><strong>Placentomegaly</strong> is a term applied to an abnormally enlarged placenta. </p><h4>Pathology</h4><h5>Associations</h5><p>It can be associated with number of maternal and fetal disorders which include:</p><ul>- +<p><strong>Placentomegaly</strong> is a term applied to an abnormally enlarged placenta. </p><h4>Pathology</h4><h5>Associations</h5><p>It can be associated with a number of maternal and fetal disorders which include:</p><ul>
-<li><a title="alpha-thalassemia" href="/articles/alpha-thalassemia">alpha-thalassemia</a></li>- +<li><a href="/articles/alpha-thalassemia">alpha-thalassemia</a></li>
-<a href="/articles/triploidy">triploid</a>: with extra set from paternal origin</li></ul>- +<a href="/articles/triploidy">triploid</a>: with an extra set from paternal origin</li></ul>
-<a href="/articles/finnish-type-congenital-nephrotic-syndrome">Finnish type congenital nephrotic syndrome</a> <sup>6<sup></sup></sup>- +<a href="/articles/finnish-type-congenital-nephrotic-syndrome">Finnish type congenital nephrotic syndrome</a> <sup>6<sup> </sup></sup>
-<li><a title="fetomaternal haemorrhage" href="/articles/fetomaternal-haemorrhage">fetomaternal haemorrhage</a></li>- +<li><a href="/articles/fetomaternal-haemorrhage">fetomaternal haemorrhage</a></li>
-<li><a title="intraplacetnal haemorrhage " href="/articles/intraplacetnal-haemorrhage">intraplacetnal haemorrhage </a></li>- +<li><a href="/articles/intraplacetnal-haemorrhage">intraplacental haemorrhage </a></li>