Migraine, Tolosa-Hunt syndrome and pleocytosis. Correlation or coincidence?

A critical analysis is presented of the problem whether the migraine attack causes CSF-pleocytosis or vice versa, on the basis of a series of 3 cases, including one of Tolosa-Hunt syndrome due to sarcoidosis, the other two ultimately showing chronic leptomeningitis. The evidence leads to the conclusion that migraine does not cause pleocytosis and pleocytosis does not cause migraine: both are correlated by an underlying common denominator.