Which of the following is not a sign of a basilar skull fracture?

Choice A reason: Hyperglycemia is not a sign of a basilar skull fracture. It may occur in critical illness due to stress responses or diabetes but is not directly linked to skull fractures. Basilar skull fractures cause physical signs like cerebrospinal fluid leakage or bruising, not metabolic disturbances like elevated blood sugar. Choice B reason: Raccoon eyes, or periorbital ecchymosis, are a hallmark sign of a basilar skull fracture. Blood from fractured cranial bones pools around the eyes due to gravity, indicating trauma to the skull base. This results from vascular disruption and is a specific clinical finding in such injuries. Choice C reason: Battle’s sign, or mastoid ecchymosis, is a classic sign of a basilar skull fracture. Blood tracks behind the ear due to fracture-related hemorrhage in the posterior cranial fossa. This physical sign is highly specific and results from bone disruption near the mastoid process. Choice D reason: A positive halo sign test result indicates cerebrospinal fluid leakage, a common feature of basilar skull fractures. The clear fluid mixed with blood forms a halo-like ring on absorbent material, reflecting a breach in the dura mater, making it a specific diagnostic sign.