Rare diseases · Sign or symptom
Biparietal narrowing
HP:0004422
What it means
A narrowing of the biparietal diameter (i.e., of the transverse distance between the protuberances of the two parietal bones of the skull).
Rare diseases that can present with this38
Very common80–99%
9- Camptodactyly-joint contractures-facial skeletal defects syndrome
- C syndrome
- Intellectual disability, Buenos-Aires type
- Linear nevus sebaceus syndrome
- PEHO syndrome
- Ptosis-upper ocular movement limitation-absence of lacrimal punctum syndrome
- Tetraploidy syndrome
- Toluene embryopathy
- XY type gonadal dysgenesis-associated anomalies syndrome
Common30–79%
19- 8p23.1microdeletion syndrome
- Alopecia-contractures-dwarfism-intellectual disability syndrome
- Autosomal recessive chorioretinopathy-microcephaly syndrome
- Brachymorphism-onychodysplasia-dysphalangism syndrome
- Cardiofaciocutaneous syndrome
- Cleft palate-congenital heart defect-intellectual disability syndrome due to 15q14 microdeletion
- Fetal alcohol syndrome
- Hepatic fibrosis-renal cysts-intellectual disability syndrome
- Isolated Joubert syndrome
- Isotretinoin syndrome
- Joubert syndrome with hepatic defect
- Joubert syndrome with ocular anomaly
- Joubert syndrome with oculorenal defect
- Joubert syndrome with renal defect
- Lathosterolosis
- LIG4 syndrome
- Orofaciodigital syndrome type 6
- Short-limb skeletal dysplasia with severe combined immunodeficiency
- Smith-Lemli-Opitz syndrome
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: Decreased width of the skull
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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.