Rare diseases · Sign or symptom
Thyroid dysgenesis
HP:0008188
What it means
Thyroid dysgenesis is a descriptive term that should be avoided if more precise information is available. However, the HPO keeps retains this term because it is commonly used in the medical literature. In humans, the process of thyroid morphogenesis occurs from the 3rd to 16th week of gestation. Alterations occurring during this period may result in a thyroid gland that is absent (thyroid agenesis or athyreosis), hypoplastic (thyroid hypoplasia), or located in an unusual position (thyroid ectopy). All these entities are grouped under the term thyroid dysgenesis.
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: Thyroid dysplasia
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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.