Cite this page: Ziadie, M. Placental site subinvolution. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/placentaplacentalsiteinvol.html. Accessed April 22nd, 2018.
Definition / general
- Delayed / incomplete sloughing of the modified spiral arteries in the superficial myometrium beneath the placental attachment site
- Important cause of late postpartum bleeding
- May be due to deficiency in immunologic factors necessary for normal involution of uteroplacental arteries
Microscopic (histologic) description
- Curettings show large, dilated vessels that lack a medial coat and are partially / completely thrombosed
- Trophoblasts may be present