TY - JOUR T1 - Dinosaur tail sign on spinal MRI in a patient with postdural puncture headache JF - BMJ Case Reports DO - 10.1136/bcr-2017-221447 VL - 2017 SP - bcr-2017-221447 AU - Keita Sakurai AU - Satoru Morimoto AU - Masashi Kameyama AU - Mitsuhito Mase Y1 - 2017/08/02 UR - http://casereports.bmj.com/content/2017/bcr-2017-221447.abstract N2 - 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). … ER -