Merck Manual

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Sonogram of cervical star region of chorioallantois, mare
Sonogram of cervical star region of chorioallantois, mare

In late gestation, the combined thickness of the uteroplacental unit should be ≤12 mm. Placentitis, uteroplacental edema, or placental separation may cause this measurement to be >12 mm.

Courtesy of Dr. Patricia Sertich.

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Abortion in Horses