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
Decidual Cast (TW: uterine lining) : r/endometriosis
decidual cast??? sorry for gross image : r/Periods
What is a decidual cast? See photos and learn the cause behind it
Uterine (decidual) Casts - Don't Forget the Bubbles
Decidual cast from a woman - Stock Image - C058/5454 - Science
Decidual Cast: Causes, Symptoms, and When to Seek Help
Decidual cast: What it is, causes, risks, and more
Decidual Cast: What It Looks Like, Causes, Risks
Decidual Cast: What It Looks Like, Causes, Risks
Decidual Cast – Main Symptoms & Treatments
Woman Goes Viral for Detailing Rare Experience of Decidual Cast
What is a decidual cast? See photos and learn the cause behind it