Question

Double decidua sign is seen during -

• A. 1st trimester
• B. 2nd early trimester
• C. 2nd late trimester
• D. 3rd trimester

Hint:

It confirms early intrauterine pregnancy before the yolk sac appears.

Answer 1

The Correct Option is A

Step 1: The double decidual sac sign (DDSS) is an early first-trimester ultrasound feature used to confirm an intrauterine pregnancy before the yolk sac or embryo can be seen.
Step 2: It appears as two echogenic rings around the hypoechoic gestational sac. The inner ring is the chorion with embryonic disc and decidua capsularis; the outer ring is the decidua parietalis.
Step 3: Because it is an early-gestation finding tied to the appearance of the gestational sac, it is seen in the 1st trimester, making option a correct.
Step 4: The 2nd and 3rd trimester options are wrong because by then the pregnancy is well past the gestational-sac stage where this sign is assessed.