Isolated pseudoarthrosis of the limbs

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Isolated pseudoarthrosis of the limbs

ORPHA:157808Morphological anomaly

Also called Congenital pseudoarthrosis of the limbs · Isolated congenital pseudarthrosis of the limbs

What it is

A rare, genetic, non-syndromic limb malformation characterized by delayed union or non-union of a long bone, resulting in formation of a false joint, with abnormal mobility and angulation at the pseudoarthrosis site, which manifests with progressive anterolateral forearm or leg bowing, limb shortening, and non-healing fractures. Typical histopathological findings include fibromatosis-like proliferation in the soft tissues with cystic or dysplastic lesions. Neurofibromatosis and osteofibrous dysplasia are frequently associated.

Key facts

Classified as
Morphological anomaly

ICD-10 codes

Q74.8filed under a broader ICD-10 category — shared with 24 other rare diseases

ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.

Cross-references

MONDO 0015525UMLS C5190522

Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.

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