Overview
Phaeohyphomycosis is a fungal infection caused by dematiaceous fungi, characterized by diverse clinical presentations including subcutaneous, cutaneous, and systemic involvement. 1Diagnosis
Clinical Presentation: Subcutaneous infections often manifest as localized lesions, particularly in immunocompromised individuals. 1
Microscopy: Histopathological examination with hematoxylin and eosin, periodic acid-Schiff, and Gomori methenamine silver stains reveals septate hyphae and melanized structures. 1
Culture: Isolation of dematiaceous fungi from clinical specimens is crucial; specific identification techniques like UV exposure for sporulation may be necessary. 1
Special Stains: Fontana-Masson stain highlights melanin pigment in hyphae, aiding in diagnosis. 1Management
First-Line Treatment: Initial therapy with fluconazole was ineffective in the reported case; alternative antifungals targeting dematiaceous fungi are recommended. 1
Adjunctive Therapies: Specific adjunctive treatments are not detailed in the abstract; surgical debridement may be necessary for localized infections. 1
Drug Classes: Itraconazole, voriconazole, or amphotericin B are often considered based on susceptibility testing and clinical response. 1Special Populations
Immunocompromised Individuals: Increased susceptibility noted, particularly in those with underlying conditions like Wegener's granulomatosis. 1Key Recommendations
Perform histopathological examination with special stains (Fontana-Masson) to identify melanin-containing hyphae for diagnosis. (Evidence: Moderate 1)
Initiate treatment with antifungals effective against dematiaceous fungi, such as itraconazole or voriconazole, based on susceptibility results. (Evidence: Moderate 1)
Consider surgical intervention for localized, refractory infections in immunocompromised patients. (Evidence: Expert opinion 1)References
1 Padhye AA, Davis MS, Reddick A, Bell MF, Gearhart ED, Von Moll L. Mycoleptodiscus indicus: a new etiologic agent of phaeohyphomycosis. Journal of clinical microbiology 1995. link