The least common type of female pelvis is
**Core Concept**
The classification of female pelvis types is crucial in obstetrics and gynecology, as it affects childbirth and surgical procedures. The main types of female pelvis are the gynecoid, anthropoid, android, and platypelloid. Each type has distinct characteristics that influence the pelvic dimensions and potential difficulties during delivery.
**Why the Correct Answer is Right**
The platypelloid pelvis is the least common type, accounting for approximately 4-6% of the female population. This type is characterized by a flat, wide pelvic inlet and a short, narrow pelvic outlet. The platypelloid pelvis is often associated with a higher risk of complications during childbirth, such as obstructed labor and fetal distress. The flat pelvic inlet and narrow outlet can impede fetal descent, making vaginal delivery challenging.
**Why Each Wrong Option is Incorrect**
**Option A:** The gynecoid pelvis is the most common type, accounting for around 50-60% of the female population. It is characterized by a round, wide pelvic inlet and a spacious pelvic outlet, making it the most favorable type for vaginal delivery.
**Option B:** The anthropoid pelvis is the second most common type, accounting for around 20-30% of the female population. It is characterized by a long, narrow pelvic inlet and a wide pelvic outlet, making it suitable for vaginal delivery, especially in cases of fetal macrosomia.
**Option C:** The android pelvis is the least common male pelvis type, but it can occur in females, particularly in cases of androgen excess or Turner syndrome. It is characterized by a narrow, heart-shaped pelvic inlet and a short, narrow pelvic outlet, making it less favorable for vaginal delivery.
**Clinical Pearl / High-Yield Fact**
Remember that the type of pelvis plays a significant role in determining the mode of delivery and potential complications. A thorough understanding of pelvis types is essential for obstetricians and gynecologists to make informed decisions during childbirth.
**Correct Answer: D. platypelloid.**