The condition shown in the picture above represents ectopic pregnancy.
The commonest type of ectopic pregnancy with presented with rupture is Isthmic.
Abortion is common in ampullary pregnancies, whereas rupture is the usual outcome with isthmic pregnancies.
As a rule, whenever there is tubal rupture in the first few weeks, the pregnancy is situated in the isthmic portion of the tube.
When the fertilized ovum is implanted well within the interstitial portion, rupture usually occurs later.