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Start free with EleplanNon-syndromic unilambdoid craniosynostosis
ORPHA:620113Morphological anomaly
Also called Isolated occipital plagiocephaly · Isolated unilamboid craniosynostosis · Non-syndromic posterior synostotic plagiocephaly · Non-syndromic unilateral lambdoid synostosis
What it is
A form of non-syndromic unisutural craniosynostosis characterized by premature fusion of one of the two lambdoid sutures, resulting in ipsilateral occipitoparietal flattening, contralateral parietal and frontal bossing, occipitomastoid bulge, and posterior-inferior displacement of the ipsilateral ear. The skull appears trapezoid from above, while the face is typically C-shaped with ipsilateral convexity.
Key facts
- Prevalence
- <1 / 1 000 000
- Age of onset
- Neonatal
- Inheritance
- Autosomal recessive
- Classified as
- Morphological anomaly
Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.
ICD-10 codes
ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.
Related health topics
Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
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