This is called a decidual cast. It occurs when the lining of a woman's uterus sheds as one massive solid piece of tissue during her period. : r/MakeMeSuffer
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We just learned this horrifying fact about periods, and we wish we
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Internet Scientific Publications
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I think I passed a decidual cast (TMI PICTURE)
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What is a decidual cast? See photos and learn the cause behind it
I think I passed a decidual cast (TMI PICTURE)
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Everything You Need to Know About a Decidual Cast
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Everything You Need to Know About a Decidual Cast
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Decidual Cast: What Is It, Symptoms, and When to Seek Help
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Decidual Cast: What It Looks Like, Causes, Risks