Normal pregnancy: double decidual sign: practice question

A OBG 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.

Try it

OBG · Normal pregnancy: double decidual sign

Sample item

On transvaginal ultrasound at 5 weeks, a woman with pain and bleeding has an intrauterine fluid collection that is surrounded by two concentric echogenic rings. What does this finding support?

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

The answer and the reasoning

C. A true gestational sac of an early intrauterine pregnancy

The double decidual sign, two concentric echogenic rings formed by the decidua capsularis and decidua parietalis, supports a true gestational sac. A pseudosac in ectopic pregnancy has only a single ring and is central in the cavity. The intradecidual sign and the yolk sac give further confirmation.

Option by option

  • A. A pseudogestational sac of ectopic pregnancy

    A pseudosac shows a single layer and no double ring.

  • B. A functional ovarian cyst

    A cyst lies in the adnexa and not in the cavity.

  • C. A true gestational sac of an early intrauterine pregnancy (correct)

    Correct. Two concentric rings support a true intrauterine gestational sac.

  • D. A hydatidiform mole

    A mole shows a heterogeneous mass with vesicles.

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.

More OBG questions

Questions about this OBG question

What is the answer to this OBG question?

The best answer is C, A true gestational sac of an early intrauterine pregnancy. The double decidual sign, two concentric echogenic rings formed by the decidua capsularis and decidua parietalis, supports a true gestational sac.

Why is "A pseudogestational sac of ectopic pregnancy" not the answer?

A pseudosac shows a single layer and no double ring.

Why is "A functional ovarian cyst" not the answer?

A cyst lies in the adnexa and not in the cavity.

Why is "A hydatidiform mole" not the answer?

A mole shows a heterogeneous mass with vesicles.

What concept does this question test?

It tests Normal pregnancy: double decidual sign in OBG. A pseudosac in ectopic pregnancy has only a single ring and is central in the cavity. The intradecidual sign and the yolk sac give further confirmation.

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 Normal pregnancy: double decidual sign?

Learn management algorithms as steps: PPH, eclampsia, ectopic pregnancy. Then use the flashcards and the other OBG 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.