Cite this page: Ziadie MS. Polyps. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/placentapolyp.html. Accessed December 8th, 2021.
Definition / general
- Placental polyps are intrauterine polyps due to retention of placental tissue, reported after induced abortions (Hum Pathol 1988;19:1467) and term pregnancies
- Amniotic polyps have been reported in triploid pregnancies (Am J Obstetr Gynecol 1966;96:357) and in those from infants with neonatal epidermolysis bullosa (Am J Obstet Gynecol 1988;158:150)
Microscopic (histologic) description
- Uterine placental polyps are composed of necrotic and hyalinized chorionic villi without identifiable lining trophoblast; intermediate trophoblast is usually viable; base of polyp is composed of decidua with dilated blood vessels
- Amniotic polyps are composed of thin connective tissue stalks lined by amniotic degenerating epithelium