Cutaneous Vasculitis: Classification and Approach
Cutaneous vasculitis encompasses a diverse group of vascular inflammatory disorders that primarily affect the skin, presenting with a range of clinical manifestations. Accurate classification and understanding of its underlying mechanisms are essential for effective diagnosis and management in dermatology practice.
Topics: vasculitis, purpura, systemic
Overview / DefinitionCutaneous vasculitis refers to inflammation of the blood vessels in the skin, leading to various dermatological manifestations. These conditions can be idiopathic or secondary to systemic diseases, infections, or medications. The clinical spectrum can range from palpable purpura to ulcerations and necrosis, necessitating a thorough evaluation.EpidemiologyCutaneous vasculitis occurs across diverse populations, with varying prevalence based on underlying causes. It is often seen in adults aged 50-70 years, with a slight female predominance. Secondary vasculitis is more common than primary forms, often linked to systemic diseases such as systemic lupus erythematosus (SLE) or rheumatoid arthritis.Incidence rates vary based on geographical and demographic factors.Prevalence may be higher in certain ethnic groups.Age and gender can influence the type and severity of vasculitis.Pathophysiology / MechanismThe pathophysiology of cutaneous vasculitis involves immune-mediated mechanisms resulting in vascular inflammation. This can be triggered by:Immune complex deposition: Often seen in conditions like SLE.Antineutrophil cytoplasmic antibodies (ANCA): Associated with small vessel vasculitis.Direct endothelial injury: Can occur due to infections or drugs.Clinical PresentationClinical manifestations of cutaneous vasculitis can vary significantly, including:Palpable purpura: Commonly found on dependent areas, such as the lower extremities.Urticarial lesions: May resemble hives but are generally more persistent.Ulcerations: These may occur in severe cases.Necrosis: In cases of severe vascular compromise.Associated systemic symptoms may include fever, malaise, and arthralgias, particularly in cases of systemic involvement.Diagnosis / WorkupThe diagnosis of cutaneous vasculitis involves a combination of clinical evaluation and laboratory investigations:History and physical examination: Detailed patient history to identify potential triggers.Laboratory tests: Com