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Radiology
Amniotic Band Sequence
Built from Obstetric Imaging
What’s inside
9 sections · 80 slides
Overview
- What this deck covers
What amniotic band sequence is
The idea, the name, and how often it happens
- The idea in one line
- Why it is called a sequence, not a syndrome
- The definition in full
- The spectrum, from mildest to worst
- 1:1200 to 1:15,000
- Reading those numbers
Why it happens
Two theories, three patterns, and what triggers the tear
- Two theories, still argued over
- Inside-out: the intrinsic theory
- What the intrinsic theory explains well
- Outside-in: the extrinsic theory
- How a tear becomes an amputation
- Why some faces are cleft off-centre
- What makes the amnion tear
- Exposures linked to the condition
- Three distinct patterns, one label
- Why that study mattered
- Pattern one: constrictive tissue bands
- Pattern two: broad amniotic adhesions
- Pattern three: limb-body wall complex
- Bands versus adhesions: not the same thing
What it does to the fetus
Where bands strike, and the three kinds of damage they cause
- Where bands strike most
- Where bands strike, at a glance
- Three words that sort every finding
- Disruption: a part that was built, then broken
- Deformation: a normal part pushed out of shape
- Malformation: a part built wrongly from the start
- When the trunk is involved
- The one that can be fatal
- Amniotic band wrapped around a newborn's fingers
- What that picture is showing you
- Short blunt digits in an adult with amniotic band sequence
- Newborn foot turned inward and downward
- Ultrasound findings grouped by body region
Seeing it on ultrasound
Why the band hides, what gives it away, and where MRI helps
- Why the band itself usually hides
- The most common finding
- When to suspect the diagnosis
- Normal fetal hands and fingers on ultrasound
- Fetal fingers with absent distal phalanges
- What to notice in that rendering
- Amputation of the left fetal hand
- What to notice in the two panels
- Swelling beyond a constricting band
- What 3D and 4D scanning add
- When the spine is involved
- How the diagnosis is finally confirmed
- How to use the findings checklist
- Ultrasound Findings in Amniotic Band Sequence
- Some of those terms unpacked
- Where MRI earns its place
Look-alikes
What else could produce this finding, before the label is used
- Why the differential shifts every time
- An isolated band around a limb
- Colour Doppler at the fetal cord insertion
- What colour Doppler is doing here
- When the radius is involved: VACTERL
- When the thumbs are missing: Fanconi anemia
- Benign things that mimic a band
Treatment before birth
Fetoscopic release: what it can do, and who should not have it
- Where in-utero therapy stands
- What releasing the band can achieve
- The clearest indication: the cord
- The warning sign in the umbilical artery
- What can go wrong with the procedure
- Who should not be offered fetal surgery
Care after birth
Where to deliver, who to have in the room, and what to send to the lab
- Plan the delivery in advance
- Who may be needed in the neonatal stage
- Examining the newborn
- Send the placenta and membranes
- What the surgery involves
- How these babies do
- What to tell parents about the next pregnancy
- The path from first scan to final answer
Bringing it together
What the referring physician needs to know
- What the referring physician needs to know
- Key points, part one
- Key points, part two
- References
- References (continued)
- References (continued)
- References (continued)
- Suggested reading
- Obstetric Imaging: Fetal Diagnosis and Care, 2nd Edition