A "decidual cast" occurs when a womb sheds its lining in one go, rather than across several days. Here, a doctor explains why ...

Medically reviewed by Chioma Ndubisi, MD A decidual cast is a large, intact piece of the uterus' lining expelled from the body during menstruation. The collection of tissue, blood, and mucus retains ...

With the development of the placental tissue (consisting of the decidual cell layer, which is of maternal origin and the remaining placental tissue of fetal origin) throughout gestation ...

Each month, the lining of your womb (or endometrium) thickens up. This thickened endometrial tissue is called a "decidual lining." Normally, if you're not pregnant, you'll experience a monthly bleed.