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Living with Bencze syndrome

A rare genetic syndrome with mild uneven growth of the face and eye muscle problems.

Understanding Bencze syndrome

Bencze syndrome, also called hemifacial hyperplasia with strabismus, is a rare syndrome with uneven growth of the face.

It causes mild facial asymmetry, while the skull and eyeballs are unaffected. It also involves eyes that turn inward or cross, lazy eye (amblyopia), and sometimes a hidden cleft in the roof of the mouth. It is noted in childhood. There have been no new reports in the medical literature since 1979.

Signs & symptoms

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

  • Uneven face (facial asymmetry)
  • Crossed eyes (strabismus)
  • Lazy eye (amblyopia)
  • Eyes set widely apart (telecanthus)
  • Upward-slanting eye openings
  • Open bite

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 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
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
Which specialists should check my child's eyes and facial growth?
Is a cleft in the roof of the mouth present?
Would genetic counseling help our family?

Quick facts

Symptoms usually startChild
InheritanceAutosomal Dominant

Changes in genes cause this condition. It is autosomal dominant, so one changed copy of the gene is enough.

Genetic

Also known as: hemifacial hyperplasia strabismus syndrome; hemifacial hyperplasia with strabismus; hemifacial hyperplasia-strabismus syndrome

Patient organizations

Source: NIH GARD · Bencze syndromeGARD ID 2633 · 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 Bencze syndrome.

Explore the Bencze syndrome blog

Explore research for Bencze syndrome

Explore actively recruiting Bencze syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Bencze 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

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

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