Anembryonic pregnancy

Definition

Anembryonic pregnancy (blighted ovum) describes an intrauterine gestational sac in which an embryo has not developed or is not visualized despite expected gestational age. Diagnosis relies on ultrasound criteria (commonly MSD ≥ 25 mm without an embryo, or CRL ≥ 7 mm with absent cardiac activity) and repeat/transvaginal scanning in borderline cases. Always correlate with clinical context and serial β-hCG.

Images

Ultrasound Report - example line

Example: "Intrauterine gestational sac measuring 27 mm (MSD) with no identifiable embryo or CRL — findings consistent with anembryonic pregnancy (blighted ovum). Recommend correlation with serum β-hCG and confirmatory transvaginal scan or repeat ultrasound per protocol."

Conclusion

When MSD ≥ 25 mm without an embryo (or CRL ≥ 7 mm without cardiac activity), the ultrasound appearance is considered diagnostic of anembryonic pregnancy; otherwise, offer follow-up imaging and biochemical correlation.

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LMP

LMP not known

Scan date

CGA (weeks / days) — optional (overrides LMP)

Enter CGA to override LMP-derived GA.

MSD (mm)

CRL (mm) — if embryo seen

Observed structures

Yolk sac seen Embryo / CRL or cardiac activity seen

Tick if structure is visualized on scan (TVS preferred).

Anembryonic pregnancy assessment

MSD / CRL thresholds and follow-up guidance

Ready

Console (errors / logs):

Related cases

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Anembryonic Pregnancy — Sonography — Quiz

अनेंब्रायोनिक गर्भावस्था — सोनोग्राफी — क्विज़

10 MCQs — choose the best answer (A–D)

10 बहु-विकल्पीय प्रश्न — सर्वोत्तम उत्तर चुनें (A–D)

Created: Anembryonic Pregnancy MCQ — bilingual (EN/HI)