Which organism is commonly associated with chromoblastomycosis and phaeohyphomycosis?

• A. Candida albicans
• B. Aspergillus fumigatus
• C. Cryptococcus neoformans
• D. Dematiaceous (pigmented) fungi (e.g., Fonsecaea, Cladophialophora)

Answer: (D)

Pigmented dematiaceous fungi are the organisms commonly linked to chromoblastomycosis and phaeohyphomycosis. These infections arise after a traumatic inoculation and occur in warm, tropical regions, presenting as chronic skin and subcutaneous lesions (chromoblastomycosis) or a broader range of pigmented fungal infections (phaeohyphomycosis). In tissue, they are identifiable by their dark melanin-containing structures, such as the sclerotic bodies seen in chromoblastomycosis, and by pigmented hyphae or yeast-like forms in phaeohyphomycosis. Classic examples include Fonsecaea and Cladophialophora, which are hallmark dematiaceous fungi.

The other fungi listed cause different diseases and are not pigmented pathogens associated with these conditions: Candida albicans typically causes mucosal and systemic candidiasis; Aspergillus fumigatus causes aspergillosis; Cryptococcus neoformans causes cryptococcosis. These are not dematiaceous and do not classically produce chromoblastomycosis or phaeohyphomycosis.