Intradecidual sac sign
Last revised by Jeremy Jones on 20 Sep 2021
Citation, DOI, disclosures and article data
Citation:
Gaillard F, Jones J, Hacking C, et al. Intradecidual sac sign. Reference article, Radiopaedia.org (Accessed on 06 Oct 2024) https://doi.org/10.53347/rID-7357
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rID:
7357
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Disclosures:
At the time the article was created Frank Gaillard had no recorded disclosures.
View Frank Gaillard's current disclosures
Last revised:
20 Sep 2021,
Jeremy Jones ◉
Disclosures:
At the time the article was last revised Jeremy Jones had no recorded disclosures.
View Jeremy Jones's current disclosures
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Synonyms:
- Intradecidual sac sign (IDSS)
- IDSS
- Intradecidual sign
- Intra-decidual sign
- Intra-decidual sac sign
Intradecidual sac sign (IDSS) is a useful feature in identifying an early intrauterine pregnancy (IUP) as early as 25 days of gestation1. The threshold level (earliest one can see the sign) is 24 days of gestation and the discriminatory level (one should always see the sac) is 47 days. As per this sign, site of implantation is seen as an early gestational sac or an intrauterine fluid collection or an echogenic area in a markedly thickened decidua on one side of the uterine cavity. This can be better identified by identifying the collapsed uterine cavity.
Although useful if seen, its presence has been reported in fewer cases of IUP than originally thought (~60%), and its absence does not exclude an IUP.
History and etymology
It was first described by Yeh et al. in 1986.
References
- 1. Gupta N & Angtuaco T. Embryosonology in the First Trimester of Pregnancy. Ultrasound Clinics. 2007;2(2):175-85. doi:10.1016/j.cult.2007.07.006
- 2. Chiang G, Levine D, Swire M, McNamara A, Mehta T. The Intradecidual Sign: Is It Reliable for Diagnosis of Early Intrauterine Pregnancy? AJR Am J Roentgenol. 2004;183(3):725-31. doi:10.2214/ajr.183.3.1830725
- 3. Yeh H. Efficacy of the Intradecidual Sign and Fallacy of the Double Decidual Sac Sign in the Diagnosis of Early Intrauterine Pregnancy. Radiology. 1999;210(2):579-82. doi:10.1148/radiology.210.2.r99fe23le3
- 4. Yeh H, Goodman J, Carr L, Rabinowitz J. Intradecidual Sign: A US Criterion of Early Intrauterine Pregnancy. Radiology. 1986;161(2):463-7. doi:10.1148/radiology.161.2.3532191
- 5. Laing F, Brown D, Price J, Teeger S, Wong M. Intradecidual Sign: Is It Effective in Diagnosis of an Early Intrauterine Pregnancy? Radiology. 1997;204(3):655-60. doi:10.1148/radiology.204.3.9280240
- 6. Doubilet P & Benson C. First, Do No Harm . . . To Early Pregnancies. J Ultrasound Med. 2010;29(5):685-9. doi:10.7863/jum.2010.29.5.685
- 7. Carol M. Rumack, Deborah Levine. Diagnostic Ultrasound, 2-Volume Set. (2017) ISBN: 9780323401715
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