The Halo sign in CSF drainage is most indicative of which finding?

The Halo sign in CSF drainage is most indicative of which finding?

• A. It indicates light yellow color at the edge of clear drainage, suggesting possible CSF leakage.
• B. It indicates subarachnoid hemorrhage
• C. It indicates bacterial meningitis
• D. It indicates sample normal

Answer: (A)

The main concept here is CSF leakage. The halo sign appears when clear cerebrospinal fluid surrounds a drop of blood on a dressing or filter paper, creating a pale ring or halo. This indicates that the drainage contains CSF, not just blood, pointing to a dural breach or CSF leak after a procedure or injury. It signals a risk for meningitis if the leak isn’t managed. This differs from subarachnoid hemorrhage, which would yield drainage that is primarily bloody rather than showing a clear halo; it also differs from bacterial meningitis, where the CSF is typically turbid or purulent rather than presenting as a CSF halo around a blood drop. A normal sample would not exhibit a halo.

The main concept here is CSF leakage. The halo sign appears when clear cerebrospinal fluid surrounds a drop of blood on a dressing or filter paper, creating a pale ring or halo. This indicates that the drainage contains CSF, not just blood, pointing to a dural breach or CSF leak after a procedure or injury. It signals a risk for meningitis if the leak isn’t managed.

This differs from subarachnoid hemorrhage, which would yield drainage that is primarily bloody rather than showing a clear halo; it also differs from bacterial meningitis, where the CSF is typically turbid or purulent rather than presenting as a CSF halo around a blood drop. A normal sample would not exhibit a halo.