Fetal pole
Last revised by Jeremy Jones on 20 Sep 2021
Citation, DOI, disclosures and article data
Citation:
Radswiki T, Jones J, Stanislavsky A, et al. Fetal pole. Reference article, Radiopaedia.org (Accessed on 21 Sep 2024) https://doi.org/10.53347/rID-14871
Permalink:
rID:
14871
Article created:
1 Sep 2011,
The Radswiki ◉
Disclosures:
At the time the article was created The Radswiki had no recorded disclosures.
View The Radswiki'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
Revisions:
11 times, by
8 contributors -
see full revision history and disclosures
Systems:
The fetal pole is the first direct imaging manifestation of the fetus and is seen as a thickening on the margin of the yolk sac during early pregnancy. It is often used synonymously with the term "embryo".
The fetal pole is usually identified at ~6.5 weeks with transabdominal ultrasound imaging and at ~6 weeks 2 with transvaginal ultrasound imaging, although it may not be seen until ~9 weeks in some cases.
- a fetal pole should be seen when MSD ≥16 mm on TVS (by RCOG criteria), or MSD ≥25 mm on TAS
- pregnancy failure is not diagnosed until a fetal pole is not seen when MSD ≥25 mm on TVS
When the fetal pole measures ≥7 mm, a fetal heartbeat should be detected.
References
- 1. Hung N. Winn (Editor), John C. Hobbins (Editor). Clinical Maternal-Fetal Medicine. (2000) ISBN: 1850707987
- 2. F. Bahlmann (Contributor), R. Bollmann (Contributor), R. Chaoui (Contributor). Ultrasound in Obstetrics and GynecologyDiagnostic Ultrasound in Obstetrics: Obstetrics. (2005) ISBN: 1588901475
- 3. Jain K, Hamper U, Sanders R. Comparison of Transvaginal and Transabdominal Sonography in the Detection of Early Pregnancy and Its Complications. AJR Am J Roentgenol. 1988;151(6):1139-43. doi:10.2214/ajr.151.6.1139
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