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Living with Ossification anomalies-psychomotor developmental delay syndrome

A rare bone condition with delayed development, low muscle tone, and thin or oddly shaped bones.

Understanding Ossification anomalies-psychomotor developmental delay syndrome

Ossification anomalies-psychomotor developmental delay syndrome is a rare bone condition with developmental delay, low muscle tone, and bones that don't form normally.

Features include differences in how the skull and long bones form, a chest deformity, and bones that get thinner over time (osteopenia). Facial features can include a small head, widely spaced eyes, a narrow mouth, cleft palate, and small jaw. GARD lists newborn and infant years as the usual onset.

Signs & symptoms

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

  • Delayed development overall
  • Low muscle tone (hypotonia)
  • Bones that don't form normally
  • Thin, low-density bones
  • Narrow chest
  • Small jaw and widely spaced eyes

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, brain and nervous system specialists, genetic specialists and lung and breathing 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); Brain and nervous system specialists (neurologists); Genetic specialists (geneticists); Lung and breathing specialists (pulmonologists)
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 should bone health and fracture risk be monitored?
Does the narrow chest affect breathing?
Is genetic testing available to look for the cause?

Quick facts

Symptoms usually startNewborn and as an Infant

GARD says changes in genes cause this condition. It doesn't list a specific gene or how it is inherited.

GeneticRespiratoryNeurological

Also known as: ossification anomaly with psychomotor developmental delay syndrome

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Ossification anomalies-psychomotor developmental delay syndromeGARD ID 18921 · 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 Ossification anomalies-psychomotor developmental delay syndrome.

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