Disseminated cryptococcosis in an immunocompetent patient

Area of Science:

• Mycology
• Infectious Diseases
• Immunology

Background:

• Cryptococcosis is a systemic fungal infection primarily caused by *Cryptococcus neoformans* and *Cryptococcus gattii*.
• The infection is strongly associated with impaired cellular immunity, particularly in individuals with HIV/AIDS, organ transplant recipients, and those on immunosuppressive therapy.
• Disseminated cryptococcosis, especially in non-HIV-infected individuals, is uncommon.

Observation:

• A 56-year-old African American patient presented with unilateral knee pain and swelling.
• Initial presentation mimicked localized musculoskeletal pathology.
• Further investigation revealed a cryptococcal bone mass.

Findings:

• The patient, despite being immunocompetent, was diagnosed with disseminated cryptococcosis.
• The infection manifested as a bone mass in the knee with evidence of systemic spread.
• This case underscores the potential for cryptococcosis to affect individuals without overt immune compromise.

Implications:

• This case expands the known clinical spectrum of cryptococcosis.
• It emphasizes the importance of considering fungal infections in the differential diagnosis of bone lesions, even in immunocompetent patients.
• Further research may be warranted to understand the mechanisms underlying cryptococcal dissemination in immunocompetent hosts.