[Vasculitis with associated skin changes and dermatitis with associated vasculitis].

Area of Science:

• Dermatology
• Rheumatology
• Pathology

Context:

• Systemic vasculitis and vasculitis associated with dermatitis present with varied skin lesions.
• Standardized diagnostic criteria, such as the Chapel Hill 1994 classification, are crucial for accurate assessment.
• Skin manifestations can be non-specific, complicating diagnosis.

Purpose:

• To elucidate the diagnostic challenges of skin lesions in systemic vasculitis and dermatitis.
• To emphasize the importance of applying consistent diagnostic criteria for both conditions.
• To highlight typical and atypical presentations of vasculitic skin lesions.

Summary:

• Palpable purpura on the lower extremities is a characteristic sign of vasculitis.
• Not all dermatitis cases involve vasculitis, and vasculitis may not be present in all histological sections.
• Skin biopsy with hematoxylin and van Gieson-elastica staining is the gold standard for diagnosis.

Impact:

• Improved diagnostic accuracy for vasculitis and associated dermatitis.
• Standardized approach aids in differentiating vasculitic skin manifestations.
• Highlights the limitations and supportive role of immunohistochemical and immunological methods in diagnosis.