[Vasculitis: histopathology and differential diagnosis]

Area of Science:

• Pathology
• Immunology
• Rheumatology

Context:

• Vasculitis diagnosis relies heavily on histopathology, but differentiating causes can be challenging.
• Histopathological evaluation requires analysis of vessel characteristics, inflammation type, and immune deposits.

Purpose:

• To outline the key histopathological criteria for diagnosing vasculitis.
• To emphasize the necessity of combining histopathology with clinical and serological data for accurate classification.
• To discuss differential diagnostic challenges and discrimination methods in vasculitis.

Summary:

• A histopathologically confirmed biopsy is the gold standard for vasculitis diagnosis.
• Morphological assessment includes vessel size, inflammation type (granulomatous, necrotizing, leukocytoclastic), immune complexes, and extravascular changes.
• Accurate diagnosis requires integrating histopathological findings with organ involvement and serological data, underscoring an interdisciplinary approach.

Impact:

• Provides a framework for standardized histopathological analysis of vasculitis.
• Highlights the limitations of relying solely on histopathology, promoting a holistic diagnostic strategy.
• Aids clinicians and pathologists in achieving more precise vasculitis classification and patient management.