Obstetric imaging: oligohydramnios and Potter sequence: practice question

A Radiology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Radiology · Obstetric imaging: oligohydramnios and Potter sequence

Sample item

A fetal ultrasound at 22 weeks shows no visible kidneys, an empty bladder and severe oligohydramnios. What complication is expected in the neonate?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

A. Fatal pulmonary hypoplasia

Fetal urine is the main source of amniotic fluid in the second half of pregnancy, so renal agenesis causes anhydramnios and compression of the chest, and the lungs fail to develop (Potter sequence). Limb deformities and typical facies also occur.

Option by option

  • A. Fatal pulmonary hypoplasia (correct)

    Correct. Lack of fluid causes pulmonary hypoplasia and neonatal death.

  • B. Polycystic liver

    Polycystic liver is not a result of fluid loss.

  • C. Duodenal atresia

    Duodenal atresia causes polyhydramnios, not oligohydramnios.

  • D. Gastroschisis

    Gastroschisis is an abdominal wall defect.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Radiology question

What is the answer to this Radiology question?

The best answer is A, Fatal pulmonary hypoplasia. Fetal urine is the main source of amniotic fluid in the second half of pregnancy, so renal agenesis causes anhydramnios and compression of the chest, and the lungs fail to develop (Potter sequence).

Why is "Polycystic liver" not the answer?

Polycystic liver is not a result of fluid loss.

Why is "Duodenal atresia" not the answer?

Duodenal atresia causes polyhydramnios, not oligohydramnios.

Why is "Gastroschisis" not the answer?

Gastroschisis is an abdominal wall defect.

What concept does this question test?

It tests Obstetric imaging: oligohydramnios and Potter sequence in Radiology. Limb deformities and typical facies also occur.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Obstetric imaging: oligohydramnios and Potter sequence?

Learn signs with the image, and the disease they point to. Then use the flashcards and the other Radiology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.