Zonary placenta
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A zonary placenta also known as a ring-shaped placenta or annular placenta is an extremely rare variation in placental morphology where the placenta can appear as an annular ring. It can be a complete ring of placental tissue, but more often, tissue atrophy to part of the ring can resultsresult in a horseshoe shape placenta.
Epidemiology
Reported incidence is less than 1 in 6000 1.
Complications
The ring-shaped placenta can cause antepartum and postpartum bleeding, as well as fetal growth restriction 3.
-<p>A <strong>zonary placenta</strong> also known as a <strong>ring-shaped placenta</strong> or <strong>annular placenta</strong> is an extremely rare <a href="/articles/variation-in-placental-morphology">variation in placental morphology</a> where the placenta can appear as an annular ring. It can be a complete ring of placental tissue, but more often, tissue atrophy to part of the ring can results in a <a href="/articles/horseshoe-shape-placenta">horseshoe shape placenta</a>.</p><h4>Epidemiology</h4><p>Reported incidence is less than 1 in 6000 <sup>1</sup>.</p><h4>Complications</h4><p>The ring-shaped placenta can cause antepartum and postpartum bleeding, as well as fetal growth restriction<sup> 3</sup>.</p>- +<p>A <strong>zonary placenta</strong> also known as a <strong>ring-shaped placenta</strong> or <strong>annular placenta</strong> is an extremely rare <a href="/articles/variation-in-placental-morphology">variation in placental morphology</a> where the placenta can appear as an annular ring. It can be a complete ring of placental tissue, but more often, tissue atrophy to part of the ring can result in a <a href="/articles/horseshoe-shape-placenta">horseshoe shape placenta</a>.</p><h4>Epidemiology</h4><p>Reported incidence is less than 1 in 6000 <sup>1</sup>.</p><h4>Complications</h4><p>The ring-shaped placenta can cause antepartum and postpartum bleeding, as well as fetal growth restriction<sup> 3</sup>.</p>