Core Terms & Classification
Skin-covered (epithelialized) encephalocele
A skin-covered encephalocele is one whose sac is fully covered by skin.
In short: Skin-covered (epithelialized) encephalocele
- Skin coverage lowers the immediate risk of infection.
- It often allows planned rather than emergency surgery.
- It is one reason maternal AFP screening is often normal in encephalocele.
- An exposed or leaking sac, by contrast, is treated urgently.
What it is
"Epithelialized" means the sac has an intact skin covering rather than exposed membrane. This covering acts as a protective barrier over the protruding tissue.
Understanding Skin-covered (epithelialized) encephalocele
When the sac is skin-covered and stable, the team can take time to complete imaging and plan surgery carefully. By contrast, an exposed or leaking sac is a pathway for serious infection and is treated urgently. Skin coverage also explains a common screening pattern: because the sac is closed, it often does not raise maternal alpha-fetoprotein levels, so AFP can be normal even when an encephalocele is present — which is why imaging, not AFP, detects it.
Why it matters
Whether a sac is skin-covered affects both the timeline of care and the interpretation of prenatal screening. Families often find it reassuring that a skin-covered sac usually allows a planned, well-prepared surgery rather than an emergency.
Common questions
Why does skin coverage matter?
It reduces infection risk and usually means surgery can be planned.
Does skin coverage affect screening tests?
Yes — it is why alpha-fetoprotein levels are often normal.
What if the sac is not skin-covered?
An exposed or leaking sac is treated more urgently.
Bottom line
A skin-covered encephalocele has an intact skin covering, lowering infection risk and often allowing planned surgery.
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