Double decidual sac sign


Double decidual sac sign


→ It consists of two concentric rings surrounding an anechoic gestational sac.

  • The growing embryo pushes the central cavity complex and the decidua capsularis and parietalis are formed as 2 rings.
  • The double decidual sac sign (DDSS) is a useful feature on early pregnancy ultrasound to confirm an early intrauterine pregnancy when the yolk sac or embryo is still not visualized.
  • Where the two adhere is the decidua basalis, and is the site of future placental formation.
  • If a double decidual sac sign is present (~53% of IUPs) , then it is highly suggestive that the intrauterine fluid collection is an intrauterine pregnancy .
  • It is absent in many IUPs, however, and its absence does not define a Pseudo gestational sac

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