Which findings on CT scan are characteristic of Haemophilus influenzae type b (Hib) meningitis?

Updated: Jul 09, 2018
  • Author: Prateek Lohia, MD, MHA; Chief Editor: Niranjan N Singh, MBBS, MD, DM, FAHS, FAANEM  more...
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Answer

On CT scanning performed because of these various indications, abnormalities are found in slightly more than 50% of all such scans. However, in most instances, these abnormalities do not require specific interventions, and their detection may not prove helpful in estimating prognosis.

Transependymal movement of CSF may be detected, especially in instances where noncommunicating hydrocephalus develops. Brain swelling may be found, and on MRI, diffuse increased T2-weighted signal may be found, representing interstitial cerebral edema. These various changes may indicate the need for management of increased ICP.

On CT scanning, brain edema causes loss of differentiation of gray and white matter. Care must be taken not to overinterpret the watery appearance of white matter in the brains of very young infants; this appearance may be normal because of the larger water content of unmyelinated tissue. Loss of sulcal markings and of the usually distinct suprasellar, perimesencephalic, and quadrigeminal cisterns may occur. Ventricular compression imparting a slitlike contour to the frontal horns may occur.


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