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Melorheostosis with osteopoikilosis

Synonym(s) MSBD syndrome
Mixed sclerosing bone dystrophy
Prevalence <1 / 1 000 000
Inheritance Autosomal dominant
Age of onset All ages
  • M85.8
  • C2931505
MeSH -
MedDRA -


Disease definition

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.

Clinical description

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 LEMD3 gene (12q14). A germline mutation in the LEMD3 gene may predispose individuals with osteopoikilosis to develop melorheostosis. However, the exact pathogenesis is currently unknown.

Genetic counseling

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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