Rare diseases · Sign or symptom
Short proximal phalanx of hallux
Short innermost big toe bone
HP:0010107
What it means
Underdevelopment (hypoplasia) of the proximal phalanx of big toe.
Rare diseases that can present with this1
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: Hypoplastic proximal phalanx of the hallux · Short proximal phalanges of halluces · Short proximal phalanx of halluces · Small proximal phalanx of big toe · Small proximal phalanx of hallux
Tracking symptoms like this for someone? Eleplan keeps symptoms, diagnoses, medications and every specialist in one plan.
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.