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Living with Multicentric osteolysis, nodulosis, and arthropathy

A rare inherited condition with loss of bone in the hands and feet, joint problems, brittle bones, and firm lumps under the skin.

Understanding Multicentric osteolysis, nodulosis, and arthropathy

Multicentric osteolysis, nodulosis, and arthropathy (MONA) is a rare inherited condition that causes bone tissue loss, especially in the hands and feet.

Bone loss usually begins in the hands and feet, causing pain and limiting movement. Later, joint problems can appear in the elbows, shoulders, knees, hips, and spine. Most people develop thin, brittle bones that fracture more easily, and short stature. Many have firm, noncancerous lumps under the skin, especially on the soles. Other features can include skin changes, cloudy corneas, extra hair growth, gum overgrowth, heart differences, and coarse facial features.

Signs & symptoms

GARD doesn't list a set of most common symptoms for this condition. Its summary describes these features:

  • Loss of bone in the hands and feet (osteolysis)
  • Joint problems (arthropathy)
  • Thin, brittle bones
  • Short stature
  • Firm lumps under the skin (nodules)
  • Cloudy corneas

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

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

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

  4. Connect with expert centers

    Little People of America may keep lists of experts for this condition.

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
Expert care
Expert lists: Little People of America
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 Little People of America
  • 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
Can genetic testing find the cause?
How can bone health and fractures be managed?
Which specialists, such as for bones and joints, should be involved?

Quick facts

GARD describes this as an inherited disease. It notes that Torg syndrome may be part of MONA or a separate disorder caused by a different gene, and does not list a specific gene here.

Also known as: al-aqeel sewairi syndrome; mona; mona, mmp2-related; multicentric osteolysis, nodulosis and arthropathy, mmp2-related; osteolysis, hereditary multicentric; torg syndrome

Patient organizations

Source: NIH GARD · Multicentric osteolysis, nodulosis, and arthropathyGARD ID 13743 · 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 Multicentric osteolysis, nodulosis, and arthropathy.

Explore the Multicentric osteolysis, nodulosis, and arthropathy blog

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Explore actively recruiting Multicentric osteolysis, nodulosis, and arthropathy studies with HealthSpark.

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