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Imaging features of central nervous system fungal infections
Krishan K Jain1, Shireesh K Mittal, Sunil Kumar
1Department of Radiology, Sanjay Gandhi Post-Graduate Institute of Medical Sciences, Lucknow - 226 014, India.
Abstract:
Fungal infections of the central nervous system (CNS) are rare in the general population and are invariably secondary to primary focus elsewhere, usually in the lung or intestine. Except for people with longstanding diabetes, they are most frequently encountered in immunocompromised patients such as those with acquired immunodeficiency syndrome or after organ transplantation. Due to the lack of inflammatory response, neuroradiological findings are often nonspecific and are frequently mistaken for tuberculous meningitis, pyogenic abscess or brain tumor. Intracranial fungal infections are being identified more frequently due to the increased incidence of AIDS patients, better radiological investigations, more sensitive microbiological techniques and better critical care of moribund patients. Although almost any fungus may cause encephalitis, cryptococcal meningoencephalitis is most frequently seen, followed by aspergillosis and candidiasis. The biology, epidemiology and imaging features of the common fungal infections of the CNS will be reviewed. The radiographic appearance alone is often not specific, but the combination of the appropriate clinical setting along with computed tomography or magnetic resonance may help to suggest the correct diagnosis.
Insights
Fungal infections of the central nervous system (CNS) are rare but increasingly identified in immunocompromised individuals. Diagnosis relies on clinical context and imaging, as radiographic findings are often nonspecific.
Area of Science:
- Neurology
- Mycology
- Infectious Diseases
Background:
- Fungal infections of the central nervous system (CNS) are uncommon, typically secondary to infections elsewhere.
- They disproportionately affect immunocompromised patients, including those with acquired immunodeficiency syndrome (AIDS) and organ transplant recipients, as well as individuals with diabetes.
- Nonspecific neuroradiological findings often lead to misdiagnosis as other conditions like tuberculous meningitis or brain tumors.
Purpose of the Study:
- To review the biology, epidemiology, and imaging features of common fungal CNS infections.
- To highlight the challenges in diagnosing these infections due to nonspecific imaging findings.
- To emphasize the importance of clinical context in conjunction with imaging for diagnosis.
Main Methods:
- Review of existing literature on fungal CNS infections.
- Analysis of epidemiological data and patient populations at risk.
- Discussion of common causative fungi, including Cryptococcus, Aspergillus, and Candida.
- Examination of neuroradiological findings on computed tomography (CT) and magnetic resonance imaging (MRI).
Main Results:
- Cryptococcal meningoencephalitis is the most frequent fungal CNS infection, followed by aspergillosis and candidiasis.
- Increased incidence of AIDS, advanced imaging, sensitive diagnostics, and improved critical care contribute to more frequent identification.
- Radiographic appearances are often nonspecific, complicating differential diagnosis.
Conclusions:
- Fungal CNS infections are increasingly recognized, particularly in immunocompromised populations.
- Accurate diagnosis requires integrating clinical presentation with advanced imaging techniques like CT and MRI.
- While imaging alone is often insufficient, it plays a crucial role when combined with appropriate clinical suspicion.
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