A 20-year-old primigravid woman is in the third trimester and has felt minimal fetal movement. An ultrasound scan shows bilaterally enlarged echogenic kidneys and a markedly decreased amniotic fluid index. She gives birth to a stillborn male fetus at 33 weeks’ gestation. At autopsy, there are deformations resulting from marked oligohydramnios, including flattening of the facies, varus deformities of the feet, and marked pulmonary hypoplasia. Microscopic examination of the liver shows multiple epithelium-lined cysts and proliferation of bile ducts. Which of the following is the most likely renal disease in this fetus?
A 20-year-old primigravid woman is in the third trimester and has felt minimal fetal movement. An ultrasound scan shows bilaterally enlarged echogenic kidneys and a markedly decreased amniotic fluid index. She gives birth to a stillborn male fetus at 33 weeks’ gestation. At autopsy, there are deformations resulting from marked oligohydramnios, including flattening of the facies, varus deformities of the feet, and marked pulmonary hypoplasia. Microscopic examination of the liver shows multiple epithelium-lined cysts and proliferation of bile ducts. Which of the following is the most likely renal disease in this fetus?
💡 Explanation
## **Core Concept**
The question describes a fetus with severe oligohydramnios, leading to various deformations, and autopsy findings of renal and hepatic abnormalities. The key concept here involves understanding the relationship between fetal renal function, amniotic fluid production, and the development of oligohydramnios. The condition described points towards a severe renal malformation.
## **Why the Correct Answer is Right**
The correct answer, **C. Congenital Polycystic Kidney Disease (CPKD)**, fits with the clinical and pathological findings presented. CPKD is characterized by the development of numerous cysts in the kidneys, which can lead to renal failure and decreased urine production. In a fetus, decreased urine production results in oligohydramnios. The presence of **multiple epithelium-lined cysts and proliferation of bile ducts in the liver** also supports this diagnosis, as CPKD can involve extrarenal manifestations, including congenital hepatic fibrosis and bile duct proliferation.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, other choices might include different renal diseases or conditions.
- **Option B:** Without the specific option provided, we can infer that any alternative diagnosis would need to explain the renal and hepatic findings as well as the oligohydramnios. Conditions like **renal agenesis** or **severe renal dysplasia** could present with oligohydramnios but would not typically cause the specific hepatic findings mentioned.
- **Option D:** Similarly, without specifics, any condition not directly linking renal failure with the described hepatic abnormalities and oligohydramnios would be less likely.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **Congenital Polycystic Kidney Disease (CPKD)** can present with extrarenal manifestations, including liver abnormalities. The association of **oligohydramnios**, **severe renal cystic changes**, and **liver abnormalities** in a fetus is highly suggestive of CPKD. This condition can lead to severe perinatal complications, including stillbirth, as seen in this case.
## **Correct Answer: C. Congenital Polycystic Kidney Disease (CPKD).**
✓ Correct Answer: B. Autosomal recessive polycystic kidney disease
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