<prompt> In craniocerebral trauma, lumbar puncture is essential in only one of the followingTo confirm raised intracranial tensionIn prolonged unconsciousnessWhen there is papilloedemaWhen meningitis is suspected  <response>: D When meningitis is suspected BACTERIAL MENINGITIS, although potentially a life-threatening infection, seldom requires neurosurgical intervention. Treatment involves confirming diagnosis identifying organism by a CSF sample, usually via lumbar puncture. Broad-spectrum intravenous i.v. antibiotics with good CSF penetration should then be commenced without delay. Ceftriaxone 2g 12 hourly metronidazole 400 mg 8 hourly adjusted as cultures sensitivities become available. 