raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:249

Fibrous dysplasia of bone

Type
Malformation syndrome
Group
Disorder
Inheritance
Not applicable
Age of onset
Adolescent, Adult, Childhood
Status
active

A rare, benign, primary bone dysplasia characterized by progressive replacement of normal bone and marrow with fibrous connective tissue in either one (monostotic) or multiple (polyostotic) bones. Clinical manifestations depend on the anatomic location of the replacement and may include bone pain, deformities, pathological fractures, and cranial nerve deficits.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enFibrous dysplasia of bone
frDysplasie fibreuse des os
deKnochendysplasie, fibröse
esDisplasia fibrosa de huesoDisplasia ósea fibrosa
itDisplasia fibrosa dell'osso
nlFibreuze dysplasie van bot
ptDisplasia óssea fibrosa
plDysplazja włóknista kości
csFibrózní kostní dysplázie
ukФіброзна дисплазія кісток
zh骨纤维发育不良
trLifli kemik displazisi

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10M85.0NTBTattributedvalidated
ICD-11FB80.0Especificvalidated
MONDO0000845Evalidated
MONDO845Evalidated
MeSHD005357Evalidated
UMLSC0259779Evalidated
GARD6444Evalidated
MedDRA10016664Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

3

Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (1):

Children (2):

4

Genes

0 direct · 2 via subtypes

Orphanet records no gene directly on this code.

Recorded by Orphanet on subtypes of this disorder:

GeneSubtypeAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
GNASORPHA:93276Polyostotic fibrous dysplasiaDisease-causing somatic mutation(s) inAssessedHGNC:4392ENSG0000008746013932020q13.32GNAS complex locus10535539[PMID]_10646121[PMID]
GNASORPHA:93277Monostotic fibrous dysplasiaDisease-causing somatic mutation(s) inAssessedHGNC:4392ENSG0000008746013932020q13.32GNAS complex locus10535539[PMID]_10646121[PMID]
5

Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—WorldwideClass onlyNot yet validatedORPHANET

Value is Orphadata's ValMoy: the mean estimate per 100 000 for prevalence and incidence, the number of cases or families for case reports.

6

HPO phenotypes

62 annotations · validated 2021-06-30
HPOTerm (as annotated by Orphanet)Diagnostic
Obligate (100%)
HP:0010734Fibrous dysplasia of the bones
Very frequent (99-80%)
HP:0009121Abnormal axial skeleton morphology
HP:0003330Abnormal bone structure
HP:0000929Abnormal skull morphology
HP:0040064Abnormality of limbs
HP:0002797Osteolysis
Frequent (79-30%)
HP:0010668Abnormal zygomatic bone morphology
HP:0011821Abnormality of facial skeleton
HP:0002823Abnormality of femur morphology
HP:0000277Abnormality of the mandible
HP:0000326Abnormality of the maxilla
HP:0031955Antalgic gait
HP:0002653Bone pain
HP:0006487Bowing of the long bones
HP:0005731Cortical irregularity
HP:0003155Elevated circulating alkaline phosphatase concentration
HP:0002148Hypophosphatemia
HP:0010657Patchy reduction of bone mineral density
HP:0002756Pathologic fracture
HP:0002748Rickets
HP:0002753Thin bony cortex
Occasional (29-5%)
HP:0031095Abnormal humerus morphology
HP:0100712Abnormal lumbar spine morphology
HP:0002818Abnormal morphology of the radius
HP:0040071Abnormal morphology of ulna
HP:0002696Abnormal parietal bone morphology
HP:0040163Abnormal pelvis bone morphology
HP:0000772Abnormal rib morphology
HP:0009911Abnormal temporal bone morphology
HP:0003319Abnormality of the cervical spine
HP:0000889Abnormality of the clavicle
HP:0430000Abnormality of the frontal bone
HP:0012294Abnormality of the occipital bone
HP:0430022Abnormality of the sphenoid sinus
HP:0002992Abnormality of tibia morphology
HP:0002812Coxa vara
HP:0004302Functional motor deficit
HP:0001288Gait disturbance
HP:0006316Irregularly spaced teeth
HP:0100559Lower limb asymmetry
HP:0002749Osteomalacia
HP:0002650Scoliosis
HP:0004322Short stature
Very rare (<4-1%)
HP:0000818Abnormality of the endocrine system
HP:0030428Cutaneous myxoma
HP:0000819Diabetes mellitus
HP:0000845Elevated circulating growth hormone concentration
HP:0000365Hearing impairment
HP:0003072Hypercalcemia
HP:0010514Hyperpituitarism
HP:0000836Hyperthyroidism
HP:0003118Increased circulating cortisol level
HP:0005605Large cafe-au-lait macules with irregular margins
HP:0007565Multiple cafe-au-lait spots
HP:0100013Neoplasm of the breast
HP:0002669Osteosarcoma
HP:0000138Ovarian cyst
HP:0003401Paresthesia
HP:0010465Precocious puberty in females
HP:0010788Testicular neoplasm
HP:0002890Thyroid carcinoma
HP:0000572Visual loss

Run the differential on the 6 obligate / very frequent terms

Annotation source: 23276185[PMID]_27492469[PMID]_27493082[PMID]_30471134[PMID]

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Sources for this card