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  Indian J Med Microbiol
 

Figure 5: An example of the “halo sign.” Cerebral spinal fluid produces a clear ring around the blood from the nose of a patient who sustained facial trauma. The halo sign should increase suspicion of a basal skull fracture.

Figure 5: An example of the “halo sign.” Cerebral spinal fluid produces a clear ring around the blood from the nose of a patient who sustained facial trauma. The halo sign should increase suspicion of a basal skull fracture.