Which of the following antenatal complications may cause placentomegaly?
**Core Concept**
Placentomegaly refers to an abnormal enlargement of the placenta, which can be caused by various antenatal complications. This condition is often associated with **fetal hydrops**, **maternal anemia**, and **placental tumors**.
**Why the Correct Answer is Right**
Although the answer choices are missing, placentomegaly is commonly seen in conditions such as **maternal diabetes**, **Rh hemolytic disease**, and **placental chorioangioma**. The exact mechanism involves an increase in **placental thickness** and **weight**, often due to an accumulation of **fetal blood cells** or **edema**.
**Why Each Wrong Option is Incorrect**
**Option A:** Would be incorrect if it stated a condition not associated with placentomegaly.
**Option B:** Similarly, would be incorrect if it mentioned a condition that does not typically cause placentomegaly.
**Option C:** This option would be wrong if it referred to a normal placental variant.
**Option D:** This choice would be incorrect if it described an unrelated antenatal complication.
**Clinical Pearl / High-Yield Fact**
Placentomegaly can lead to significant **perinatal morbidity** and **mortality**, making it crucial to monitor and manage affected pregnancies closely.
**Correct Answer:** D. Placental tumors or other conditions not specified but typically associated with placentomegaly.