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Shivam Jha: Early Pregnancy on Ultrasound: Key Sonographic Signs of Viability and Intrauterine Gestation
Shivam Jha/LinkedIn
Mar 25, 2026, 12:31

Shivam Jha: Early Pregnancy on Ultrasound: Key Sonographic Signs of Viability and Intrauterine Gestation

Shivam Jha, Sonographer at Medical imaging, shared a post on LinkedIn:

“EARLY PREGNANCY SONOGRAPHIC SIGNS

Endometrial Thickening

  • Thick, echogenic endometrium (> 8–10 mm)
  • Due to decidual reaction under progesterone
  • Earliest and nonspecific ultrasound sign of pregnancy
  • Seen before gestational sac is visible

Intradecidual Sac Sign

  • Small, round/oval fluid collection within thickened decidua
  • Located eccentrically in the endometrium
  • Surrounded by echogenic decidua
  • Suggests very early intrauterine gestation (≈ 4.5–5 weeks)
  • Helps differentiate from pseudogestational sac of ectopic pregnancy

Double Decidual Sac Sign (DDSS)

  • Two concentric echogenic rings around gestational sac
  • Represents: – Decidua capsularis (inner) – Decidua parietalis (outer)
  • Seen at 5–6 weeks
  • Highly specific for true intrauterine pregnancy
  • Absent in pseudogestational sac

Diamond Ring Sign

  • Yolk sac surrounded by a bright echogenic ring
  • Ring formed by trophoblastic tissue
  • Confirms intrauterine location
  • Indicates early viable pregnancy
  • Seen around 5 weeks

Double Bleb Sign

  • Two adjacent cystic structures inside gestational sac
  • Represents: – Yolk sac – Amniotic sac
  • Seen before fetal pole becomes visible
  • Strong indicator of early viability
  • Typically seen at 5.5–6 weeks

Fetal Pole

  • Linear or curved echogenic structure
  • Located adjacent to yolk sac
  • Represents early embryo
  • Usually visible by 5.5–6 weeks
  • Presence confirms embryonic development

Cardiac Activity

  • Detectable fetal heartbeat when CRL ≈ 5 mm
  • Usually visible by 6 weeks (TVS)
  • Best assessed using M-mode
  • Confirms viable intrauterine pregnancy
  • Absence beyond expected gestational age → poor prognosis

Corpus Luteum Cyst

  • Thick-walled ovarian cyst
  • Peripheral increased vascularity on Doppler
  • Classic ‘Ring of Fire’ sign
  • Produces progesterone to support early pregnancy
  • Supportive but not diagnostic of pregnancy

Globular Uterus / Salt and Pepper Appearance

  • Enlarged, globular uterus
  • Uniformly echogenic myometrium
  • Increased vascularity
  • Supportive sign of early pregnancy
  • Seen due to hormonal and vascular changes

Blighted Ovum (Anembryonic Pregnancy)

  • Gestational sac present without yolk sac or fetal pole
  • Mean sac diameter ≥ 25 mm with no embryo → diagnostic
  • Indicates early pregnancy failure”

Shivam Jha: Early Pregnancy on Ultrasound: Key Sonographic Signs of Viability and Intrauterine Gestation

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Amniotic sac Blighted Ovum (Anembryonic Pregnancy) Cardiac Activity Corpus Luteum Cyst cystic structures decidual reaction Diamond Ring Sign Double Bleb Sign Double Decidual Sac Sign Early Pregnancy early viability echogenic endometrium ectopic pregnancy Endometrial Thickening endometrium Fertility Fertility News fetal heartbeat Fetal Pole gestational globular uterus Globular Uterus / Salt & Pepper Appearance Intradecidual Sac Sign intrauterine gestation nonspecific ultrasound ovarian cyst pregnancy failure progesterone pseudogestational sac reproductive health Reproductive Medicine Shivam Jha trophoblastic tissue
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