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KEY POINTS

KEY POINTS

  • Adults with bacterial meningitis usually present clinically with fever, headache, meningismus, and/or signs of cerebral dysfunction; elderly patients, however, may present with insidious disease manifested only by lethargy or obtundation, variable signs of meningeal irritation, and no fever.

  • Occasionally, a patient with acute bacterial meningitis has a low cerebrospinal fluid (CSF) white cell count despite high bacterial concentrations in CSF; therefore, a Gram stain and culture should be performed on every CSF specimen, even if the cell count is normal.

  • Neuroimaging techniques have little role in the diagnosis of acute bacterial meningitis. However, computed tomography (CT) should be performed before lumbar puncture when a space-occupying lesion of the central nervous system (CNS) is suspected. Clinical features for which patients should undergo CT scanning prior to lumbar puncture are altered mental status, immunocompromise, a history of CNS disease, a history of seizure within 1 week before presentation, papilledema, and focal neurologic abnormalities.

  • Empirical antimicrobial therapy, based on the patient’s age and underlying disease status, should be initiated as soon as possible in patients with presumed bacterial meningitis; therapy should never be delayed while diagnostic tests such as CT are awaited.

  • Adjunctive dexamethasone therapy has been shown to decrease the morbidity rate in infants and children with acute Haemophilus influenzae type b meningitis and, if commenced with or before antimicrobial therapy, may also be beneficial for pneumococcal meningitis in childhood. Adjunctive dexamethasone is also associated with decreased morbidity and mortality rates in adults in high-income countries with pneumococcal meningitis when administered before the first dose of antimicrobial therapy. Adjunctive dexamethasone is associated with higher mortality in Listeria monocytogenes meningitis.

  • Fewer than 50% of patients with brain abscess present with the classic triad of fever, headache, and focal neurologic deficit; the clinical presentation of brain abscess in immunosuppressed patients may be masked by the diminished inflammatory response.

  • The diagnosis of brain abscess has been revolutionized by the development of CT; magnetic resonance imaging (MRI) offers advantages over CT in the early detection of cerebritis, cerebral edema, and satellite lesions. Restricted diffusion inside the ring-enhancing lesion differentiates a brain abscess from malignancy on diffusion-weighted imaging (DWI).

  • Aspiration of brain abscess under stereotaxic CT guidance is useful for microbiologic diagnosis, drainage, and relief of increased intracranial pressure.

  • A short course of corticosteroids should be restricted to patients with brain abscess with brain edema with deteriorating neurologic status and increased intracranial pressure.

  • Cranial subdural empyema should be suspected in patients with headache, vomiting, fever, change in mental status, and rapid progression of focal neurologic signs.

  • Spinal epidural abscess may develop acutely or chronically, with symptoms and signs of focal vertebral pain, nerve root pain, motor or sensory defects, and paralysis; the transition to paralysis may be rapid, indicating the need for emergent neurosurgical evaluation, diagnosis, and treatment.

  • Emergent neurosurgical therapy is essential for the management of subdural empyema because antibiotics do not reliably sterilize these lesions.

  • Rapid surgical decompression should be performed in patients ...

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