Commonest type of ectopic pregnancy with rupture is:
**Core Concept**
Ectopic pregnancy occurs when a fertilized ovum implants outside the uterus, often in the fallopian tube. A ruptured ectopic pregnancy is a life-threatening emergency that requires prompt surgical intervention. The commonest type of ectopic pregnancy with rupture is typically associated with a specific anatomical location.
**Why the Correct Answer is Right**
The commonest type of ectopic pregnancy with rupture is the interstitial or tubal ectopic pregnancy. This type of ectopic pregnancy occurs when the fertilized ovum implants in the interstitial portion of the fallopian tube, which is the portion that passes through the uterine wall. The interstitial portion of the fallopian tube is a narrow, muscular segment that is prone to rupture due to its thin walls and high pressure environment. This type of ectopic pregnancy is more likely to rupture due to the high pressure of the surrounding myometrium and the narrow diameter of the interstitial portion of the tube.
**Why Each Wrong Option is Incorrect**
**Option A:** Cervical ectopic pregnancy is extremely rare and not commonly associated with rupture.
**Option B:** Ovarian ectopic pregnancy is not a recognized entity, as the ovary does not have a similar environment for implantation.
**Option C:** Abdominal ectopic pregnancy is a misnomer and is not a recognized category of ectopic pregnancy.
**Clinical Pearl / High-Yield Fact**
The classic presentation of a ruptured ectopic pregnancy includes abdominal pain, hemodynamic instability, and a positive pregnancy test. It is essential to maintain a high index of suspicion for ectopic pregnancy in any woman of reproductive age presenting with acute abdominal pain.
**Correct Answer: C. Interstitial or tubal ectopic pregnancy.**