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Palisading granulomas caused by infectious diseases
W P Su1, M K Kuechle, M S Peters
1Department of Dermatology, Mayo Clinic, Rochester, MN 55905.
The American Journal of Dermatopathology
|June 1, 1992
Summary
Infectious causes of palisading granulomas are often missed. Special stains on biopsy specimens are crucial for diagnosing infections like phaeohyphomycosis in immunosuppressed patients.
Area of Science:
- Pathology
- Infectious Diseases
- Dermatology
Background:
- Palisading granulomas are a histological pattern observed in various conditions.
- Infectious etiologies are not always considered in the initial differential diagnosis.
Observation:
- A case of palisading granuloma was initially diagnosed without an identified infectious cause.
- Special stains and tissue culture revealed phaeohyphomycosis.
Findings:
- A review of 2,500+ granuloma cases identified 11 instances of infectious palisading granulomas.
- Infections included phaeohyphomycosis, mycobacteriosis, syphilis, cat-scratch disease, sporotrichosis, cryptococcosis, and coccidioidomycosis.
Implications:
- Infectious diseases must be considered in the differential diagnosis of palisading granulomas.
- Biopsy specimens with palisading granuloma and central necrosis warrant special stains for pathogens, particularly in immunocompromised individuals.