Late First Trimester (11-13w 6d)

📝 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

─── 🧾 Late First Trimester (11-13w 6d) ───

Templates

▸

NORMAL FETAL FINDINGS (11–13 WEEKS 6 DAYS)

📄 Single Live Intrauterine Fetus

FETAL VIABILITY ABNORMALITIES

📄 Absent Cardiac Activity (Fetal Demise)

📄 Persistent Bradycardia

📄 Persistent Tachycardia

FETAL GROWTH ABNORMALITIES

📄 CRL Smaller than Expected for Dates

📄 Failure of Interval Fetal Growth

📄 CRL–Gestational Age Discordance

EARLY PREGNANCY FAILURE (LATE FIRST TRIMESTER)

📄 Missed Abortion

📄 Incomplete Abortion

📄 Inevitable Abortion

MULTIPLE PREGNANCY (11–13 WEEKS)

📄 Dichorionic Diamniotic Twins (Lambda sign)

📄 Monochorionic Diamniotic Twins (T-sign)

📄 Monochorionic Monoamniotic Twins

📄 Vanishing Twin (Residual GS / Placental Remnant)

📄 CRL Discordance (>10–15%)

📄 Nuchal Translucency Discordance

📄 Early Twin-to-Twin Transfusion Syndrome (Stage 0 / NT discordance)

📄 Single Fetal Demise in Twin Pregnancy

📄 Vanishing Twin (Residual Findings)

📄 Fetus Papyraceus ❌No (Seen in 2nd Trimester)

📄 Tubal Ectopic ❌No

PLACENTAL ABNORMALITIES (EARLY DIAGNOSABLE)

📄 Low-lying Placenta

📄 Placenta Previa (Early)

📄 Placental Thickness Abnormality

📄 Placental Cyst / Lacunae

📄 Placental Mass (Suggestive of Partial Mole)

📄 Subchorionic / Retroplacental Hematoma

UMBILICAL CORD ABNORMALITIES

📄 Single Umbilical Artery (Early suspicion)

📄 Short Umbilical Cord (Subjective)

📄 Marginal Cord Insertion

📄 Velamentous Cord Insertion (Early)

📄 Umbilical Cord Cyst (True / Pseudocyst)

AMNIOTIC FLUID ABNORMALITIES

📄 Oligohydramnios (Early)

📄 Polyhydramnios (Early suspicion)

📄 Amniotic Band / Sheet

📄 Discordant Amniotic Fluid in Twins

📄 Absent Amniotic Membrane (Monoamniotic Twins)

NUCHAL TRANSLUCENCY & EARLY ANEUPLOIDY MARKERS

📄 Increased Nuchal Translucency (>95th percentile)

📄 Cystic Hygroma (Septated NT)

📄 Absent / Hypoplastic Nasal Bone

📄 Abnormal Ductus Venosus Flow (Absent / Reversed a-wave)

📄 Tricuspid Regurgitation (>60 cm/s)

📄 Increased NT with Normal Karyotype (Risk of Cardiac Defect)

📄 Abnormal Frontomaxillary Facial Angle

📄 Enlarged Intracranial Translucency

EARLY STRUCTURAL ABNORMALITIES (NT SCAN)

📄 Anencephaly

📄 Acrania / Exencephaly Sequence

📄 Holoprosencephaly (Alobar)

📄 Absent Intracranial Translucency (Early Spina Bifida Marker)

📄 Cleft Lip (Early Detection)

📄 Micrognathia (Early Suspicion)

📄 Suspected Congenital Heart Disease

📄 Abnormal Cardiac Axis

📄 Abnormal Four-Chamber View

📄 Omphalocele

📄 Gastroschisis

📄 Megacystis (Bladder >7 mm)

📄 Bilateral Renal Agenesis (Early Suspicion)

📄 Short Long Bones (Early Dysplasia Marker)

📄 Limb Reduction Defect

📄 Hydrops Fetalis (Early)

📄 Increased NT with Multiple Anomalies

MOLAR PREGNANCY (LATE FIRST TRIMESTER)

📄 Partial Hydatidiform Mole with Fetus

📄 Twin Pregnancy: Complete Mole with Coexisting Fetus

📄 Complete Mole ❌No

📄 Invasive Mole ❌No

📄 Choriocarcinoma ❌No

ASSOCIATED COMPLICATIONS

📄 Subchorionic Hematoma

📄 Early Placental Insufficiency

📄 Retroplacental Hemorrhage

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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 “Late First-Trimester Fetal Assessment (11–13+6 Weeks)” has been prepared solely for educational and academic purposes. The biometric parameters (CRL, NT, nasal bone, FHR, etc.), measurements, examples, and references included are illustrative in nature and intended for structured learning. Clinical correlation, standardized protocol adherence, follow-up imaging, and professional medical judgment are essential before making any diagnostic or management decisions.

Author: ____________________
Name: R. K. Mouj [Radio-imaging Technologist]
Domain: Diagnostic Sonography & Obstetric Imaging
Special Focus: Late First-Trimester Screening (NT Scan)
Platform: SonoAcademy
Supervisor / Guide: Department Radiologist
Department: Radiology

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