Early First Trimester (GS) ultrasound

📝 FETAL ULTRASOUND TEMPLATES

🧾 Early First Trimester (GS)

🧾 First Trimester (Embryo 6–10w 6d)

🧾 First Trimester (11–13w 6d)

🧾 Second Trimester

🧾 Third Trimester

🧾 NT Screening

🧾 NT Screening – Specific Doppler

🧾 Fetal Anomalies Screening / TIFA

🧾 TIFA-Specific Fetal Doppler

🧾 Doppler Studies

🧾 Biophysical Profile / NST

🧾 RMT Assessment

───🧾 Early First Trimester (GS) ultrasound ───

Templates

▸

NORMAL GS FINDINGS

📄 Very Early Pregnancy

📄 Double Decidual Sac Sign

📄 GS

📄 GS + Yolk Sac

📄 GS Interval Growth Assessment [if-IVF]

ABNORMAL GESTATIONAL SAC

📄 Irregular Gestational Sac

📄 Small Gestational Sac for Dates

📄 Collapsed / Crenated Gestational Sac

📄 Low-Lying Gestational Sac

GS CONTENT ABNORMALITIES

📄 Empty Gestational Sac (Anembryonic Pregnancy)

📄 Absent Yolk Sac

📄 Enlarged Yolk Sac

📄 Irregular / Calcified Yolk Sac

📄 Absent Fetal Pole

FAILURE OF INTERVAL GROWTH

📄 Static Gestational Sac Size

📄 Slow GS Growth (<1 mm/day)

📄 GS Smaller than CRL

📄 Interval Non-visualization of Embryo

POOR PROGNOSTIC GS SIGNS

📄 Irregular GS + Enlarged Yolk Sac

📄 Abnormal GS with Absent Cardiac Activity

TWIN & MULTIPLE PREGNANCY (GS BASED)

📄 Dichorionic Diamniotic Twins (Two GS)

📄 Monochorionic Diamniotic Twins

📄 Monochorionic Monoamniotic Twins

📄 Twin Pregnancy with Vanishing Twin

📄 Trichorionic Triamniotic Triplets (Three GS)

📄 Dichorionic Triamniotic Triplets

📄 Monochorionic Triamniotic Triplets

📄 Higher-Order Pregnancy (Quadruplets or More)

📄 Vanishing Fetus in Multiple Pregnancy

ECTOPIC PREGNANCY (GS RELATED)

📄 Pseudogestational Sac

📄 Tubal Ectopic Pregnancy

📄 Interstitial (Cornual) Pregnancy

📄 Cervical Ectopic Pregnancy

📄 Cesarean Scar Pregnancy

📄 Ovarian Ectopic Pregnancy

📄 Abdominal Ectopic Pregnancy

📄 Heterotopic Pregnancy

📄 Ovarian Ruture Ectopic Pregnancy

📄 Tubal Ectopic Pregnancy

MOLAR PREGNANCY (GESTATIONAL TROPHOBLASTIC DISEASE)

📄 Complete Hydatidiform Mole

📄 Partial Hydatidiform Mole

📄 Early Complete Mole (Pre–snowstorm appearance)

📄 Pregnancy with Complete Mole and Coexisting Normal GS

📄 Invasive Mole ❌ No

📄 Choriocarcinoma ❌ No

📄 Placental Site Trophoblastic Tumor (PSTT) ❌ No

📄 Epithelioid Trophoblastic Tumor (ETT) ❌ No

OTHER SPECIAL CONDITIONS

📄 Subchorionic Hematoma

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Patient Info

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End of Topic

You have reached the end of this First-Trimester Ultrasound topic.

Content is intended for educational, training, and clinical reference only.

Declaration:
I, R. K. Mouj, declare that the material presented in this topic titled “First-Trimester Gestational Sac (GS) Assessment” has been prepared solely for educational and academic purposes. Any measurements, examples, or references provided are illustrative in nature. Clinical correlation, follow-up imaging, and professional judgment are essential before making diagnostic or management decisions.

Author: ____________________
Name: R. K. Mouj [Radio-imaging Technologist]
Domain: Diagnostic Sonography & Obstetric Imaging
Platform: SonoAcademy
Supervisor / Guide: Department radiologist
Department: Radiology

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