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Living with Grant syndrome

A very rare bone condition like osteogenesis imperfecta, described in two patients, with blue whites of the eyes and a small jaw.

Understanding Grant syndrome

Grant syndrome is a rare osteogenesis imperfecta-like disorder, described in two patients to date.

Features include persistent extra small bones in the skull (wormian bones), blue sclera (whites of the eyes), a small lower jaw, a shallow shoulder socket, and bowing of the limbs (campomelia). GARD says there have been no further descriptions in the literature since 1986. It is noticed in the newborn period.

Signs & symptoms

Symptoms vary. GARD lists these among the most common:

  • Extra small bones in the skull (wormian bones)
  • Bowing of the long bones
  • Slowed skull bone formation
  • Very flexible joints
  • Flat nasal bridge
  • Rib and pelvis differences

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, eye disease specialists and genetic specialists.

  3. Ask which tests can help

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

Care & treatment

Care team
Bone and joint specialists (orthopedists or orthopedic surgeons); Eye disease specialists (ophthalmologists); Genetic specialists (geneticists)
Expert care
Ask about multidisciplinary care centers for rare conditions
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 rare disease patient organizations for support
  • 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
How is Grant syndrome different from osteogenesis imperfecta?
Which specialists, such as bone or genetics doctors, should follow this condition?
How should fracture risk and jaw development be monitored?

Quick facts

Symptoms usually startNewborn
InheritanceAutosomal Dominant

Changes in genes cause this condition, and it is inherited in an autosomal dominant way, which means one changed copy of a gene can be enough. GARD does not name the gene.

Genetic

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Grant syndromeGARD ID 2559 · 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 Grant syndrome.

Explore the Grant syndrome blog

Explore research for Grant syndrome

Explore actively recruiting Grant syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Grant 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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