Rare diseases · Sign or symptom

Duplication of phalanx of hallux

Duplication of big toe bone

HP:0010066

What it means

Partial or complete duplication of one or more phalanx of big toe.

Rare diseases that can present with this2

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: Duplicated hallux · Duplication of great toes · Duplication of phalanx of big toe · Hallucal duplication · Partial/complete duplication of the phalanges of the hallux

Duplication of phalanx of hallux

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This page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.