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Cryptococcal antigen tests are vital for HIV/AIDS patients. However, a negative serum test in a disseminated cryptococcosis case highlights the need for cerebrospinal fluid analysis.

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Area of Science:

  • Infectious Diseases
  • Medical Diagnostics
  • Immunocompromised Patient Care

Background:

  • Cryptococcal infection poses significant risks for immunocompromised individuals, particularly those with HIV/AIDS.
  • The cryptococcal antigen (CrAg) lateral flow assay (LFA) is a widely used diagnostic tool, valued for its speed, sensitivity, and specificity.
  • Despite its utility, the CrAg LFA has limitations that necessitate complementary diagnostic approaches.

Observation:

  • This case report focuses on a patient diagnosed with disseminated cryptococcosis.
  • The patient presented with a negative serum CrAg LFA result.
  • A brain magnetic resonance imaging (MRI) scan of the patient was unremarkable.

Findings:

  • The case illustrates a scenario where disseminated cryptococcosis was present despite a negative serum CrAg LFA.
  • Cerebrospinal fluid (CSF) testing revealed the presence of cryptococcal infection, contradicting the serum assay.
  • The unremarkable brain MRI did not exclude the possibility of disseminated disease.

Implications:

  • Cerebrospinal fluid testing remains crucial for diagnosing cryptococcosis in high-risk immunocompromised patients, even with negative serum CrAg LFA results.
  • This case underscores the importance of considering clinical suspicion and utilizing multiple diagnostic modalities.
  • Relying solely on serum CrAg LFA may lead to delayed diagnosis and treatment in certain patient populations.