Rare diseases · Sign or symptom

Triangular epiphysis of the middle phalanx of the 2nd finger

Triangular end part of the middle bone of the index finger

HP:0009523

Rare diseases that can present with this1

Sometimes5–29%

1

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

Abnormality of the epiphysis of the middle phalanx of the 2nd fingerTriangular epiphyses of the 2nd fingerTriangular epiphyses of the middle phalanges of the hand
Triangular epiphysis of the middle…

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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.