Abnormal communication b/w the subarachnoid space and the tympanomastoid nasal cavity.
The cause of CSF rhinorrhoea was established by ommaya et al (1968) as:
[table id=33 /]
[table id=34 /]
Later the cause of CSF rhinorrhoea are varied and revised in 1976 as:
Congenital
- Meningocoele or
- Meningoencephalocele
- Congenital skull base defect
- Congenital hydrocephalus
