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Ultrasonographic appearance of structures
GA in weeks
GA in weeks
Transvaginal US
Transabdominal US
Gestational sac
4‐5
5‐6
Yolk sac
5‐6
6‐7
Embryo
5‐6
6‐7
FHB
5‐6
6‐7
Transvaginal ultrasound (TVS)
• Thickened endometrium/Decidual reaction in ectopic
• Corpus luteum
• 32‐34 days: echogenic ring: trophoblast
Week 4
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