Brachydactyly type A1

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Brachydactyly type A1

ORPHA:93388Malformation syndrome

Also called Brachydactyly, Farabee type

What it is

A rare, congenital limb malformation characterized by shortened or underdeveloped middle phalanges of all digits, that are sometimes fused with the terminal phalanges. The proximal phalanges of the thumbs and big toes are also shortened. Short stature in adulthood has been reported in association.

Key facts

Age of onset
Infancy, Neonatal
Inheritance
Autosomal dominant
Classified as
Malformation syndrome

Signs and symptoms

These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.

Genes

BMPR1BDisease-causing germline mutation(s) (loss of function)
GDF5Disease-causing germline mutation(s) (loss of function)
IHHDisease-causing germline mutation(s)

ICD-10 codes

Q73.8filed under a broader ICD-10 category — shared with 25 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

GARD 978MESH C537088MONDO 0007215OMIM 112500OMIM 607004OMIM 615072OMIM 616849UMLS C1862151

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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