Syndactyly type 3

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Syndactyly type 3

ORPHA:93404Morphological anomaly

Also called SD3 · Syndactyly of fingers 4 and 5

What it is

A rare non-syndromic syndactyly characterized by complete and bilateral syndactyly between the 4th and 5th fingers. In most cases, it is a soft tissue syndactyly, but occasionally the distal phalanges may be fused. The middle phalanx of the fifth finger is usually hypoplastic, and the feet are not affected.

Key facts

Age of onset
Infancy, Neonatal
Inheritance
Autosomal dominant
Classified as
Morphological anomaly

Signs and symptoms

Very common80–99%

1

Sometimes5–29%

1

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.

Gene

GJA1Disease-causing germline mutation(s)

ICD-10 codes

Q70.1filed under a broader ICD-10 category — shared with 4 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 5088MESH C538154MONDO 0008514OMIM 186100UMLS C1861366

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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