In the june 2008 images in emergency medicine,1 traumatic cerebrospinal fluid leak is shown by the picture of blood and cerebrospinal fluid separating to form a halo sign on bed linen. The halo test (d) is a less precise method of determining if csf is present in the otorrhea or rhinorrhea of a head trauma patient A drop of the fluid is placed on a tissue or filter paper, and a rapidly expanding ring (halo) of clear fluid around red blood defines a positive test. The halo test is a diagnostic procedure designed to detect cerebrospinal fluid (csf) leakage It involves applying a fluid sample to filter paper and observing for a halo effect, indicating the presence of csf. It happens when cerebrospinal fluid leaks from the nose or ears, making a halo shape on gauze or tissue
This sign is important for diagnosing head trauma It means there might be a skull fracture causing a cerebrospinal fluid leak Finding this sign fast can help prevent serious infections. The “halo” or “double ring sign is a form of pillow chromatography The blood components separate from the csf as they move through the pillow fabric, creating a clear ring or halo surrounding a bloody spot.
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