noun which may take the genitive case particle 'no'
intracranial; endocranial
Medical term meaning 'inside the skull'. Used attributively with の, as in 頭蓋内出血 (intracranial hemorrhage).
Intracranial hemorrhage requires emergency treatment.
頭蓋外 means 'extracranial', the opposite of 頭蓋内.
intracranial injury
Compound of 頭蓋 (skull, cranium) + 内 (inside). A straightforward medical term.