In ectopic pregnancy, the most common reaction seen in uterus is
Decidual reaction : Increased structural and secretory activity of the endometrium that is brought about in response to progesterone Progesterone levels fall due to fall in the hcG levels Endometrium sloughs out causing uterine bleeding. Ref: Dutta Obs 9e pg 169.
Decidual reaction
Arias stella reaction
Double decidual sac sign
Stallwohy sign
General obstetrics