A primigravida at 8 weeks gestation has an ultrasound showing a gestational sac with mean sac diameter of 30 mm but no yolk sac or embryo. What is the diagnosis?

• A Missed abortion
• B Incomplete abortion
• C Ectopic pregnancy
• D Anembryonic pregnancy (blighted ovum) ✓

Explanation

Anembryonic pregnancy (blighted ovum) is diagnosed when the mean sac diameter is 25 mm or greater without an embryo on transvaginal ultrasound. This represents a failed early pregnancy where the gestational sac develops but no embryo forms. Missed abortion implies a nonviable embryo that was previously present. Incomplete abortion involves retained products with an open os and bleeding. Ectopic pregnancy would typically show an empty uterus with adnexal findings.

Reference: Williams Obstetrics, 26th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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