Acalvaria is a rare malformation consisting of absence of the calvarial bones, dura mater and associated muscles in the presence of a normal skull base and normal facial bones. The central nervous system is usually unaffected.
References
Harris CP, Townsend JJ, Carey JC (1993). "Acalvaria: a unique congenital anomaly". Am J Med Genet46: 694-9. PMID 8362912
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