Rare diseases · Sign or symptom
Abnormal intramembranous ossification
HP:0012790
What it means
An anomaly in the process of intramembranous ossification by which flat bones (cranial bones of the skull, i.e., the frontal, parietal, occipital, and temporal bones, and the clavicles) are formed.
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: Abnormal intramembranous bone ossification
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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.