York 2001. p.417. Murros K Fogelholm R. Spontaneous intracranial hypotension with slit ventricles. J Neurol 62 Neurosurg Psychiatry 1983. 46:1149. Headache Classification Subcommittee of the International Headache Society. The International 63 Classification of Headache Disorders: 2nd edition. Cephalalgia 2004. 24 Suppl 1:9. Bon