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Living with Trigonocephaly-broad thumbs syndrome

A rare genetic condition with a triangle-shaped forehead from early skull closure, plus broad thumbs and toes.

Understanding Trigonocephaly-broad thumbs syndrome

Trigonocephaly-broad thumbs syndrome is a rare genetic condition with a triangle-shaped forehead (trigonocephaly) at birth and differences in the fingers and toes.

Skull seams close early (craniosynostosis). People can also have shallow eye sockets, an unusual nose, fingers bent to the side, and broad toes with an extra bone at the tip. It is noticed in the newborn period or infancy.

Signs & symptoms

GARD doesn't list specific symptoms for this condition yet, but the summary describes these features:

  • Triangle-shaped forehead (trigonocephaly)
  • Early closing of skull seams (craniosynostosis)
  • Shallow eye sockets
  • Fingertips bent to the side
  • Broad toes
  • An unusually shaped nose

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 bone and joint 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
Bone and joint specialists (orthopedists or orthopedic surgeons); 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 be on a craniofacial care team?
Does the skull shape need surgery or monitoring?
Would genetic counseling help our family?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Dominant

GARD says changes in genes (variants) cause this condition and that it is autosomal dominant, so one changed copy of a gene can be enough. It doesn't name a specific gene.

Genetic

Also known as: hunter rudd hoffmann syndrome; hunter-rudd-hoffmann syndrome; trigonocephaly with broad thumb syndrome

Patient organizations

Source: NIH GARD · Trigonocephaly-broad thumbs syndromeGARD ID 2756 · 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 Trigonocephaly-broad thumbs syndrome.

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