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Primary low cerebrospinal fluid pressure syndrome associated with galactorrhea.

A 36-year-old woman with positional headache was found to have primary low cerebrospinal fluid (CSF) pressure syndrome and galactorrhea. The CSF pressure at lumbar puncture was not measurable. Magnetic resonance imaging demonstrated that the ventricle and cerebral sulcus were narrowed and the pituitary stalk was oppressed by the brain. Hyperresponsiveness of prolactin was noted after stimulation with thyrotropin-releasing hormone. These abnormalities disappeared with normalization of CSF pressure with the treatment. Galactorrhea was apparently due to oppression of the pituitary stalk by downward movement of the brain.