Budding yeast in a child with acute leukemia: Nothing CRYPT(O)IC about it

Area of Science:

• Medical Mycology
• Hematology
• Pediatric Oncology

Background:

• Disseminated cryptococcosis is a rare fungal infection, particularly in immunocompromised pediatric patients.
• Acute lymphoblastic leukemia (ALL) treatment can increase the risk of opportunistic infections like cryptococcosis.
• Early detection of fungal pathogens in blood cultures is crucial for timely management.

Observation:

• A 13-year-old girl with B-cell precursor ALL presented with fever, fatigue, and an iliac mass.
• Blood cultures revealed budding yeast cells, indicative of Cryptococcus.
• Unusual crystalloid geometric structures resembling Buckminsterfullerene were observed, derived from the Cryptococcus capsule.

Findings:

• The case represents a rare instance of disseminated cryptococcosis in a pediatric leukemia patient.
• Identification of Cryptococcus from Gram stains can be challenging, underscoring the importance of yeast morphology in blood cultures.
• The presence of Buckminsterfullerene-like structures is a rare and remarkable finding.

Implications:

• This case emphasizes the need for a broad differential diagnosis for yeast in blood cultures of immunocompromised children.
• Recognizing unique fungal structures can aid in diagnosis and understanding pathogen-host interactions.
• Further research into the formation and significance of these crystalloid structures in Cryptococcus is warranted.