Calcified yolk sac
A calcified yolk sac has been described as a sign of intrauterine demise. The cause of yolk sac calcification in failed pregnancies is uncertain but is likely related to dystrophic calcification.
Radiographic features
Ultrasound
- abnormal increased echogenicity of the yolk sac with posterior acoustic shadowing and possibly comet tail artefact
Practical points
- indeterminate abnormal yolk sac abnormality that should not be considered alone for the diagnosis of failed early pregnancy
- follow-up ultrasonography at 7-14 days to assess the pregnancy for viability is generally appropriate
Related Radiopaedia articles
First trimester of pregnancy
-
first trimester
- ultrasound findings in early pregnancy
- confirming intrauterine gestation
- pregnancy of unknown location (PUL)
- first trimester vaginal bleeding
- aneuploidy testing
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