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Citation:
Weerakkody Y, Stanislavsky A, Morgan M, Small gestational sac. Reference article, Radiopaedia.org (Accessed on 25 Apr 2024) https://doi.org/10.53347/rID-30066
A small gestational sac in early first trimester is considered a poor prognostic factor. Some authors use the mean sac diameter to crown rump length difference of 5 mm or greater to be normal 1.
The smaller than expected sac diameter in pregnancies 36-42 days from the last menstrual period has been reported as a predictor of spontaneous miscarriage 2.
The difference between the two values should not be used in embryos older than 9 weeks 5.
See also
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1. Bromley B, Harlow BL, Laboda LA et-al. Small sac size in the first trimester: a predictor of poor fetal outcome. Radiology. 1991;178 (2): 375-7. doi:10.1148/radiology.178.2.1987595 - Pubmed citation
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2. Oh JS, Wright G, Coulam CB. Gestational sac diameter in very early pregnancy as a predictor of fetal outcome. Ultrasound Obstet Gynecol. 2002;20 (3): 267-9. doi:10.1046/j.1469-0705.2002.00774.x - Pubmed citation
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3. Dickey RP, Olar TT, Taylor SN et-al. Relationship of small gestational sac-crown-rump length differences to abortion and abortus karyotypes. Obstet Gynecol. 1992;79 (4): 554-7. Pubmed citation
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4. Nazari A, Check JH, Epstein RH et-al. Relationship of small-for-dates sac size to crown-rump length and spontaneous abortion in patients with a known date of ovulation. Obstet Gynecol. 1991;78 (3 Pt 1): 369-73. Pubmed citation
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5. Rowling SE, Coleman BG, Langer JE, Arger PH, Nisenbaum HL, Horii SC. First-trimester US parameters of failed pregnancy. Radiology. 203 (1): 211-7. doi:10.1148/radiology.203.1.9122395 - Pubmed
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