Blastomycosis presenting as recurrent tender cutaneous nodules.

Area of Science:

• Mycology
• Infectious Diseases
• Clinical Medicine

Background:

• Blastomycosis is a serious fungal infection caused by inhaling spores of Blastomyces dermatitidis.
• This dimorphic fungus is endemic in specific regions of North America, primarily associated with soil.
• The disease manifests with a broad clinical spectrum, ranging from asymptomatic cases to severe pneumonia and disseminated infections.

Observation:

• The case presented with a fever of unknown etiology, a challenging diagnostic scenario.
• Recurrent skin nodules were a prominent and unusual clinical manifestation in this patient.
• Diagnosis was confirmed by identifying characteristic Blastomyces yeasts in tissue samples.

Findings:

• Blastomycosis diagnosis relies on microscopic yeast identification or fungal culture.
• Itraconazole is recommended for mild to moderate pulmonary blastomycosis.
• Amphotericin B is reserved for severe, life-threatening, or refractory cases, including CNS involvement and pregnancy.

Implications:

• This case underscores the diverse and sometimes atypical presentations of blastomycosis.
• Fever of unknown origin and skin nodules warrant consideration of endemic mycoses.
• Accurate and timely diagnosis is crucial for effective treatment and improved patient outcomes.