TY - JOUR T1 - Coagulation of cerebrospinal fluid—the Nonne–Froin sign JF - Practical Neurology JO - Pract Neurol SP - 273 LP - 274 DO - 10.1136/practneurol-2012-000473 VL - 13 IS - 4 AU - Niklas Mattsson AU - Richard Montelius AU - Anders Holtz AU - Lisa Mouwitz AU - Kaj Blennow AU - Henrik Zetterberg Y1 - 2013/08/01 UR - http://pn.bmj.com/content/13/4/273.abstract N2 - A 60-year-old previously healthy woman sought medical attention at a memory clinic for subjective cognitive impairment. Neurological and cognitive testing was normal, except that she performed at the lower limit of normal in A Quick Test of Cognitive Speed (AQT) and Rey complex figure tests. MRI of the brain was normal. As a part of the investigation she underwent lumbar puncture, a routine procedure in memory investigations in Sweden.The cerebrospinal fluid (CSF) was found to be yellow and viscous. The CSF flow through the lumbar … ER -