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Melorheostosis with osteopoikilosis
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.
ORPHA:1879Classification level: Disorder
- MSBD syndrome
- Mixed sclerosing bone dystrophy
- Prevalence: <1 / 1 000 000
- Inheritance: Autosomal dominant
- Age of onset: All ages
- ICD-10: M85.8
- OMIM: -
- UMLS: C2931505 C3149695
- MeSH: -
- GARD: 3690
- MedDRA: -
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 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.
Osteopoikilosis is inherited autosomal dominantly. There are no reports of parent to child transmission of melorheostosis. Genetic counseling is possible.
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