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A 68-year-old man presented with cognitive impairment, urinary incontinence and short step gait. These symptoms, together with brain MRI finding, suggested idiopathic normal pressure hydrocephalus. After a spinal tap test to confirm the diagnosis, he suffered from postdural puncture headache. Despite an equivocal finding on spinal MR myelography (MRM), lumbosacral fat-suppressed T2-weighted image (FST2WI) clearly showed the characteristic ‘Dinosaur tail sign’ indicative of cerebrospinal fluid (CSF) leakage (figure 1).1 This pathognomonic sign disappeared on symptom improvement (figure 1). …
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