Abstract
Spontaneous intracranial hypotension(SIH),by definition, is spontaneous and without any obvious cause. The exact pathoqenesis of SIH is still not clear. However, an occult cerebrospinal fluid(CSF)leak is considered as the cause of most if not all SIH.A 38-year-old woman with postural headache and low CSF pressure was reported in this article. The 99mTc-diethyltri-aminepentacetic acid(DTPA)radionuclide cisternography(RNC)was performed and showed accumulation of radiotracer in the extra-arachnoid space over upper portion of thoracic spine. Besides, the indirect signs of early appearance of urinary bladder radioactivity on the30-min image and poor migration of radiotracer over the cerebral convexities on the 24-h image were also noted. RNC is able to detect and localize the site of CSF leak and is useful as an initial diagnostic study of choice in SIH
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