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

We just learned this horrifying fact about periods, and we wish we

Internet Scientific Publications

I think I passed a decidual cast (TMI PICTURE)

What is a decidual cast? See photos and learn the cause behind it

I think I passed a decidual cast (TMI PICTURE)

Everything You Need to Know About a Decidual Cast

Everything You Need to Know About a Decidual Cast

Decidual Cast: What Is It, Symptoms, and When to Seek Help

Decidual Cast: What It Looks Like, Causes, Risks