Diagnosis of cryptococcal meningitis by cytologic methods: an old technique revisited

Area of Science:

• Neurology
• Infectious Diseases
• Cytopathology

Background:

• Cryptococcal meningitis is a serious fungal infection of the central nervous system.
• Accurate and timely diagnosis is crucial for effective treatment and patient outcomes.

Purpose of the Study:

• To evaluate the diagnostic utility of routine cytologic examination of cerebrospinal fluid (CSF) for cryptococcal meningitis.
• To assess the accuracy of CSF cytology compared to other diagnostic methods.

Main Methods:

• Retrospective analysis of seven patients with suspected central nervous system infections.
• Review of cerebrospinal fluid (CSF) cytology results.
• Correlation with clinical presentation, cryptococcal antigen titers, and brain biopsy findings where available.

Main Results:

• Routine CSF cytologic examination correctly diagnosed cryptococcal meningitis in six out of seven patients.
• One patient presented with a false-positive cryptococcal antigen titer and negative CSF cytology, later diagnosed with herpes simplex encephalitis via brain biopsy.

Conclusions:

• CSF cytologic examination is a valuable and recommended diagnostic tool for suspected cryptococcal meningitis.
• In cases with discordant results or atypical presentations, further diagnostic investigations are warranted.