[Headache with transient neurologic deficits and lymphocytosis in the cerebrospinal fluid].

Background: Patients with episodes of headache associated with transient neurologic deficits and lymphocytes in the cerebrospinal fluid have been reported over the last two decades.
Material and Methods: We present five patients without a prior history of migraine who experienced a limited series of 1-10 episodes of headache associated with transient neurologic deficits and lymphocytosis ranging from 85 to 500 x 10(6)/l in the cerebrospinal fluid.
Results: Some patients had elevated protein levels in the cerebrospinal fluid and focal EEG pathology. Analysis of cerebrospinal fluid, blood tests and imagining investigations did not give plausible aetiological explanations.
Interpretation: The prognosis of this syndrome is good. Its aetiology is unknown. It is reasonable to search for neurotropic viruses in future cases.