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Living with Primary microcephaly-mild intellectual disability-young-onset diabetes syndrome

A rare genetic condition with a small head from birth, mild intellectual disability, short stature, seizures and diabetes in the teens or young adulthood.

Understanding Primary microcephaly-mild intellectual disability-young-onset diabetes syndrome

Primary microcephaly-mild intellectual disability-young-onset diabetes syndrome is a rare genetic condition that affects growth, learning and blood sugar.

People are born with a small head and low birth weight and have short stature, developmental delay and mild intellectual disability. Seizures can begin in childhood and diabetes in the teen years or young adulthood. Walking trouble, skeletal differences and liver scarring in infancy may also occur. Brain shape is typically normal.

Signs & symptoms

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

  • Small head from birth (microcephaly)
  • Short stature and low birth weight
  • Developmental delay and mild intellectual disability
  • Seizures
  • Diabetes in the teen years or early adulthood
  • Delayed puberty

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, genetic specialists and hormone specialists.

  3. Ask which tests can help

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

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists); Hormone specialists (endocrinologists)
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
Would genetic testing help find the cause in our family?
When should we begin screening for diabetes?
Which therapies and seizure treatments can help?

Quick facts

Symptoms usually startChild and as a Teenager
InheritanceAutosomal Recessive

GARD says changes in genes cause this condition but doesn't name a gene. It is autosomal recessive, meaning a child inherits a changed copy of the gene from each parent.

GeneticNeurologicalEndocrine

Also known as: primary microcephaly, mild intellectual disability, young-onset diabetes syndrome

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Primary microcephaly-mild intellectual disability-young-onset diabetes syndromeGARD ID 17620 · 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 Primary microcephaly-mild intellectual disability-young-onset diabetes syndrome.

Explore the Primary microcephaly-mild intellectual disability-young-onset diabetes syndrome blog

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