Rare diseases · Sign or symptom
Duplication of the distal phalanx of the thumb
Duplication of the outermost bone of the thumb
HP:0009612
What it means
Complete or partial duplication of the distal phalanx of the thumb. Depending on the severity, the appearance on x-ray can vary from a notched phalanx (the duplicated bone is almost completely fused with the phalanx), a partially fused appearance of the two bones, or two separate bones appearing side to side.
Part of the broader category
Also called: Double thumb distal phalanges · Duplicated terminal phalanx of thumb · Duplication of distal thumb phalanx · Duplication of terminal thumb phalanx · Partial/complete duplication of the distal phalanx of the thumb
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Start free with EleplanThis 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.