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Cryptococcus meningoencephalitis in AIDS: parenchymal and meningeal forms
J Berkefeld1, W Enzensberger, H Lanfermann
1Institut für Neuroradiologie, Klinikum der Johann-Wolfgang-Goethe Universität, Frankfurt am Main, Germany. Berkefeld@em.uni-frankfurt.de
Neuroradiology
|March 25, 1999
Summary
Cryptococcus neoformans infections in immunocompromised patients can present as enhancing brain lesions or widened perivascular spaces. Imaging findings depend on the host
Area of Science:
- Neuroimaging
- Infectious Diseases
- Immunocompromised Hosts
Background:
- Cryptococcus neoformans is an opportunistic pathogen causing significant morbidity and mortality in immunocompromised individuals.
- Cerebral cryptococcosis can manifest with diverse imaging findings, posing diagnostic challenges.
Observation:
- Two cases of Cryptococcus neoformans infection in immunocompromised patients revealed distinct neuroimaging features on CT and MRI.
- Case 1: Contrast-enhancing parenchymal lesions resembling cryptococcomas were observed, despite extensive meningeal infection shown in CSF, with no radiological signs of meningitis.
- Case 2: Dilation of Virchow-Robin spaces and parenchymal cysts were the primary findings in a patient with proven cryptococcal meningitis, without enhancing masses.
Findings:
- The study suggests two potential radiological patterns of C. neoformans infection in immunocompromised hosts: enhancing parenchymal lesions (cryptococcomas) and widened perivascular spaces.
- Enhancing cryptococcomas may indicate a more invasive form of the infection with an inflammatory response in the brain parenchyma.
- Widened Virchow-Robin spaces or cysts are associated with more typical meningeal infection, highlighting varied host immune responses.
Implications:
- These findings underscore the importance of correlating neuroimaging findings with clinical and CSF analysis in diagnosing and managing cryptococcal CNS infections.
- Understanding these distinct radiological patterns can aid in predicting disease progression and guiding treatment strategies in immunocompromised patients.
- The study highlights that enhancement of cryptococcomas, usually indicative of inflammation, is atypical in immunocompromised patients, suggesting altered inflammatory responses.