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 the same shape as the uterus.

Hysterosalpingography. This special x-ray test uses dye to help detect abnormal changes in the size and shape of the uterus and fallopian tubes. Hysteroscopy. An office procedure that uses a small, ...