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Melorheostosis with osteopoikilosis

Orpha number ORPHA1879
Synonym(s) MSBD syndrome
Mixed sclerosing bone dystrophy
Prevalence -
Inheritance Autosomal dominant
Age of onset All ages
ICD-10
  • M85.8
ICD-O -
OMIM -
UMLS
  • C2931505
MeSH -
MedDRA -

Summary

Melorheostosis with osteopoikilosis is a rare sclerosing bone dysplasia, combining the clinical and radiological features of melorheostosis and osteopoikilosis (see these terms), that has been reported in some families with osteopoikilosis and that is characterized by a variable presentation of limb pain and deformities.

Less than 5 families have been reported in the literature to date.

As osteopoikilosis is a benign, usually asymptomatic condition, the clinical signs are primarily those of melorheostosis that can manifest with joint contractures, pain, stiffness, limited joint functions, limb-length discrepancy and deformity.

The combination of melorheostosis with osteopoikilosis may be an unusual complication of familial osteopoikilosis. Osteopoikilosis is caused by a germline mutation in the LEMD3gene (12q14). A germline mutation in the LEMD3 gene may predispose individuals with osteopoikilosis to develop melorheostosis. However, the exact pathogenesis is currently unknown.

Osteopoikilosis is inherited autosomal dominantly. There are no reports of parent to child transmission of melorheostosis. Genetic counseling is possible.

Expert reviewer(s)

  • Pr Geert MORTIER

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