Skip to content
knowrare
HealthSignal
Your condition community

Living with Hydrolethalus syndrome

A severe genetic condition seen before birth that affects the face, brain, heart, lungs, and limbs.

Understanding Hydrolethalus syndrome

Hydrolethalus syndrome is a severe condition seen before birth that affects the head and face, brain, heart, airway, and limbs.

It causes differences in facial features, the central nervous system, the heart, the breathing tract, and the limbs. It may be found during pregnancy or in newborns.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Cleft lip or palate
  • Small lower jaw (micrognathia)
  • Extra little finger
  • Low-set, backward-rotated ears
  • Corpus callosum not formed
  • Too much amniotic fluid (polyhydramnios)

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists, ear, nose, and throat specialists and genetic specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    World Craniofacial Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Ear, nose, and throat specialists (otolaryngologists); Genetic specialists (geneticists)
Expert care
Expert lists: World Craniofacial Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with World Craniofacial Foundation and other patient organizations
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
What can prenatal imaging tell us?
Which specialists should be on our care team?
Would genetic counseling help with future pregnancies?

Quick facts

Symptoms usually startduring Pregnancy and as a Newborn
InheritanceAutosomal Recessive

Changes in genes (also called variants) cause this condition. It is autosomal recessive, so a child inherits a changed copy of the gene from each parent.

GeneticNeurological

Also known as: hydrolethalus; salonen-herva-norio syndrome

Patient organizations

Source: NIH GARD · Hydrolethalus syndromeGARD ID 6683 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Hydrolethalus syndrome.

Explore the Hydrolethalus syndrome blog

Explore research for Hydrolethalus syndrome

Explore actively recruiting Hydrolethalus syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Hydrolethalus syndrome with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

Powered by HealthSpark, our AI chat helper

I can help you find recruiting Hydrolethalus syndrome studies. Enter a ZIP code, address or city below and I'll look within 50 miles.

Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

Get Signals for Hydrolethalus syndrome

Stay in the loop with community stories and updates from medical researchers.

HealthStoryfor Hydrolethalus syndrome

Create a living journal that talks back

HealthStory evolves private journaling with a living AI journal that talks back and asks thoughtful questions, helping you capture your Hydrolethalus syndrome experiences more deeply and prepare for better conversations with your doctors and care team.

Start your journal

Your journal is private. Sharing your story publicly is a separate choice, made with Share your story above.