[Pseudomigraine with CSF pleocytosis: intermittent measurement of the intracranial pressure. Case report].

Pseudomigraine with pleocytosis is a self-limited and rather benign disorder, characterized by recurrent bouts of migrainous headaches, associated to focal neurological symptoms and to cerebrospinal fluid abnormalities. We have submitted an individual with pseudomigraine to three lumbar punctures. The first and the third lumbar punctures, carried out during symptomatic periods, revealed a cerebrospinal fluid with aseptic lymphomonocytic pleocytosis, and an opening pressure of 400 and 440 mmH2O, respectively. The cerebrospinal fluid pressure measured during an asymptomatic period was normal (190 mmH20). Although the underlying mechanisms of this disorder remain elusive, there is some evidence that suggests an involvement of autoimmune mechanisms leading to a reduction of the cerebral blood flow, similar to that seen in the cortical spreading depression. In this report, we raise the possibility of a contributory role to be played by the elevated cerebrospinal fluid pressure on the pathophysiology of this disorder.