A woman treated for infertility, presents with 6 week amenorrhea with urinary retention. The most likely etiology is:
**Core Concept**
The patient's presentation of 6-week amenorrhea with urinary retention is suggestive of a condition that affects both reproductive and urinary systems. This condition is often associated with hormonal imbalance, particularly an excess of estrogen.
**Why the Correct Answer is Right**
The most likely etiology in this case is a **molar pregnancy** (hydatidiform mole). A molar pregnancy is a type of gestational trophoblastic disease (GTD) characterized by an abnormal proliferation of trophoblastic cells, leading to an excessive production of human chorionic gonadotropin (hCG). The high levels of hCG stimulate the ovaries to produce excess estrogen, which in turn causes endometrial hyperplasia and amenorrhea. Additionally, the molar tissue can invade the uterine wall and compress the bladder, leading to urinary retention.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided.
* **Option B:** While **multiple pregnancy** (twins or triplets) can cause amenorrhea, it is less likely to cause urinary retention due to the proximity of the bladder to the uterus.
* **Option C:** **Pregnancy with cervical stenosis** can cause urinary retention, but it would not explain the amenorrhea.
* **Option D:** **Pregnancy with an ectopic pregnancy** can cause amenorrhea, but it would not explain the urinary retention.
**Clinical Pearl / High-Yield Fact**
A molar pregnancy can be diagnosed with a beta hCG level greater than 100,000 mIU/mL, and ultrasound findings of a "snowstorm" appearance of the endometrial cavity.
**Correct Answer:** .