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Acalvaria is a rare malformation defined as missing scalp and flat bones over an area of the cranial vault. The size of the affected area is variable. In rare cases, acalvaria involves the whole of the dome-like superior portion of the cranium comprising the frontal, parietal, and occipital bones. Dura mater and associated muscles are absent in the affected area but the central nervous system is usually unaffected, although some neuropathological abnormality is often present (e.g. holoprosencephaly or gyration anomalies). Skull base and facial bones are normal.
Biomarker and diagnostic research for acalvaria has been reported in the published literature.
Estimated prevalence: Unknown (Unknown prevalence).
No clinical trials have been registered for acalvaria.
20 publications have been identified in PubMed for acalvaria. Research spans Case Report / Case Series (55%), Basic Science / Preclinical (15%), and Diagnostic / Biomarker (10%).
Research Type | Count | % of Total |
|---|---|---|
Patient case studies | 11 | 55% |
Data assembled from 3 of 12 sources · Last updated Sep 18, 2026, 3:02 PM UTC
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about acalvaria
3 |
15% |
Testing and diagnosis research | 2 | 10% |
Research summaries | 2 | 10% |
Other research | 1 | 5% |
New treatment approaches | 1 | 5% |
Bijok J (2026). [PMID: 41753031](https://pubmed.ncbi.nlm.nih.gov/41753031/). *Journal of clinical medicine*. [Case Report / Case Series]
Varghese TA (2026). [PMID: 41767134](https://pubmed.ncbi.nlm.nih.gov/41767134/). *Ultrasound (Leeds, England)*. [Case Report / Case Series]
Botvinik A (2026). [PMID: 41714291](https://pubmed.ncbi.nlm.nih.gov/41714291/). *Prenatal diagnosis*. [Basic Science / Preclinical]
Yang S (2025). [PMID: 41267385](https://pubmed.ncbi.nlm.nih.gov/41267385/). *Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine*. [Case Report / Case Series]
Meagher S (2025). [PMID: 40569057](https://pubmed.ncbi.nlm.nih.gov/40569057/). *Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology*. [Review / Meta-Analysis]
Ragab AbdelSalam A (2025). [PMID: 40965213](https://pubmed.ncbi.nlm.nih.gov/40965213/). *Neurosurgery*. [Case Report / Case Series]
Żalińska A (2025). [PMID: 40710866](https://pubmed.ncbi.nlm.nih.gov/40710866/). *Reports (MDPI)*. [Gene Therapy / Novel Therapeutics]
Estevam MV (2025). [PMID: 40510280](https://pubmed.ncbi.nlm.nih.gov/40510280/). *The Canadian veterinary journal = La revue veterinaire canadienne*. [Case Report / Case Series]
Karim JN (2025). [PMID: 41289226](https://pubmed.ncbi.nlm.nih.gov/41289226/). *PLoS medicine*. [Diagnostic / Biomarker]
Katwal S (2025). [PMID: 39687835](https://pubmed.ncbi.nlm.nih.gov/39687835/). *Radiology case reports*. [Case Report / Case Series]