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Living with Radioulnar synostosis-microcephaly-scoliosis syndrome

An extremely rare syndrome with a fused forearm, small head, curved spine, short stature, and intellectual disability.

Understanding Radioulnar synostosis-microcephaly-scoliosis syndrome

Radioulnar synostosis-microcephaly-scoliosis syndrome, also called Guiffre-Tsukahara syndrome, is an extremely rare syndrome.

It combines fused forearm bones with a small head size (microcephaly), a curved spine (scoliosis), short stature, and intellectual disability. GARD lists onset during pregnancy or in the newborn period.

Signs & symptoms

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

  • Fused forearm bones
  • Small head size (microcephaly)
  • Scoliosis
  • Short stature
  • Intellectual disability and delayed development
  • Delayed bone maturation

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.

Care & treatment

Care team
Bone and joint specialists (orthopedists or orthopedic surgeons); 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
Is genetic testing available to find the cause?
How should the scoliosis be monitored?
What supports can help with learning and development?

Quick facts

Symptoms usually startduring Pregnancy and as a Newborn

GARD says gene changes cause this condition. It doesn't name a gene or describe inheritance yet.

Genetic

Also known as: giuffre-tsukahara syndrome; giuffré-tsukahara syndrome; tsukahara syndrome

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Radioulnar synostosis-microcephaly-scoliosis syndromeGARD ID 394 · 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 Radioulnar synostosis-microcephaly-scoliosis syndrome.

Explore the Radioulnar synostosis-microcephaly-scoliosis syndrome blog

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