Most common uterine malformation associated with poor obstetric outcome
**Core Concept**
Uterine malformations are congenital anomalies of the uterus that can impact fertility and obstetric outcomes. The most common uterine malformation is a unicornuate uterus, but it's not typically associated with poor obstetric outcomes. However, another type of uterine malformation, Müllerian duct anomalies, can lead to complications during pregnancy.
**Why the Correct Answer is Right**
The correct answer is a septate uterus. A septate uterus is a type of Müllerian duct anomaly characterized by the presence of a septum or wall of tissue that partially or completely divides the uterine cavity. This malformation can lead to poor obstetric outcomes due to increased risk of miscarriage, preterm labor, and fetal growth restriction. The septum can also cause difficulties during delivery, such as prolonged labor and increased risk of cesarean section.
**Why Each Wrong Option is Incorrect**
**Option A:** Unicornuate uterus is a rare condition where one side of the uterus is underdeveloped, but it's not typically associated with poor obstetric outcomes.
**Option B:** Bicornuate uterus is a type of Müllerian duct anomaly where the uterus is divided into two separate horns, but it's not as commonly associated with poor obstetric outcomes as a septate uterus.
**Option C:** Didelphys uterus is a rare condition where a woman has two separate uteri, but it's not typically associated with poor obstetric outcomes.
**Clinical Pearl / High-Yield Fact**
A septate uterus is the most common type of Müllerian duct anomaly and is associated with an increased risk of miscarriage, preterm labor, and fetal growth restriction. It's essential to diagnose and manage this condition to improve obstetric outcomes.
**Correct Answer:** D. Septate uterus