Glial tissue in the uterus

The discovery of glial tissue in curettings from 4 women with histories of abortion is reported. In 3, the glial tissue was localized in polypoid cervical mucosa, and in the fourth, fragments of glial tissue were found in the corpus mucosa. It is claimed that the glial tissue probably represents fetal central nervous tissue implanted in the uterus at the time of curetting. The reasons for the continuing vitality over a period of many years and, in some cases, the proliferation of the implant are discussed.