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Primary amoebic (Naegleria) meningoencephalitis
Abstract:
The computed tomographic (CT) appearance of a case of primary meningoencephalitis due to the free living amoeba Naegleria fowleri is presented. The cisterns around and above the midbrain and the subarachnoid spaces were obliterated on precontrast CT. Marked enhancement in these regions was seen after intravenous contrast medium administration. The sulci and adjacent grey matter were also strongly enhanced. The ventricular size was normal. Pathological findings were those of arachnoiditis and invasion of the leptomeninges and brain substance by amoebae, especially at the base of the brain and cerebellum.
Insights
Computed tomography (CT) reveals primary meningoencephalitis caused by Naegleria fowleri. Imaging shows obliterated cisterns and sulci enhancement, with pathological findings confirming amoebic invasion of the brain and meninges.
Area of Science:
- Neurology
- Radiology
- Infectious Diseases
Background:
- Primary amoebic meningoencephalitis (PAM) is a rare and fatal infection caused by the free-living amoeba Naegleria fowleri.
- Early diagnosis is crucial for patient management, but CT findings can be subtle.
Observation:
- This case presents the computed tomographic (CT) appearance of PAM.
- Precontrast CT demonstrated obliterated cisterns around the midbrain and subarachnoid spaces.
- Postcontrast CT revealed marked enhancement in these areas, along with enhancement of sulci and adjacent grey matter.
Findings:
- Pathological examination confirmed arachnoiditis and invasion of the leptomeninges and brain substance by Naegleria fowleri.
- Amoebic infiltration was particularly noted at the base of the brain and cerebellum.
- Ventricular size remained normal throughout the observed period.
Implications:
- CT imaging can aid in the diagnosis of Naegleria fowleri meningoencephalitis by showing characteristic patterns of enhancement.
- Understanding these radiological findings is important for clinicians managing suspected cases of PAM.
- Further research into early diagnostic markers and treatment strategies for PAM is warranted.