Leakage of cerebrospinal fluid from the ears or nose may accompany basilar skull fracture. CSF can be distinguished from other body fluids because the drainage will separate into bloody and yellow concentric rings on the dressing material, called a halo sign. The fluid also tests positive for glucose.
Cerebrospinal fluid
All vertebrates have cerebrospinal fluid, which is a clear, colourless bodily fluid that is present in the tissue that covers their brains and spinal cords. Specialized ependymal cells in the choroid plexus of the brain's ventricles create CSF, which is then absorbed in arachnoid granulations.
The ventricular system and subarachnoid space, which are located surrounding and inside the brain and spinal cord, respectively, are occupied by CSF. It fills the spinal cord's central canal as well as the brain's ventricles, cisterns, and sulci.
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