Cytomegalovirus central nervous system compartmentalization in a patient presenting with AIDS

Area of Science:

• Neuroscience
• Infectious Diseases
• Virology

Background:

• Cytomegalovirus (CMV) central nervous system (CNS) involvement is rare and difficult to diagnose, often presenting with symptoms mimicking other neurological conditions.
• Human immunodeficiency virus (HIV)-positive individuals are susceptible to opportunistic infections, including CMV, which can affect the CNS.

Observation:

• A case study of an HIV-positive patient with neurological symptoms (headache, confusion, ataxia) and multiple concurrent opportunistic diseases (neurotoxoplasmosis, Kaposi's sarcoma, CMV infection).
• CMV CNS involvement was initially overlooked due to the patient's complex comorbidities and the absence of detectable CMV DNA in plasma.
• Cerebrospinal fluid (CSF) analysis revealed a high CMV viral load (31,340 copies/ml) despite undetectable plasma CMV DNA.

Findings:

• Ganciclovir treatment followed by valganciclovir maintenance led to symptom improvement, enhanced MRI findings, and sustained undetectable CMV DNA in plasma.
• The case highlights diagnostic challenges in HIV patients with co-occurring cerebral conditions and the potential for CMV CNS replication independent of plasma viral load.

Implications:

• This case underscores the importance of considering CMV encephalitis in HIV-positive patients presenting with neurological deficits, even with multiple comorbidities.
• It highlights gaps in understanding optimal treatment durations and strategies for CMV CNS disease in immunocompromised individuals.
• The findings emphasize the need for CSF viral load monitoring in suspected cases, as plasma CMV DNA levels may not accurately reflect CNS viral activity.