Lesional patterns

 leukocytoclastic vasculitis
 lymphocytic vasculitis
 neutrophilic vasculitis
 necrotizing vasculitis
 granulomatous vasculitis

• Wegener granulomatosis
• Churg-Strauss syndrome
• necrotizing sarcoid granulomatosis
• giant cell arteritis

Etiology

 infectious cutaneous vasculitis
 inflammatory cutaneous vasculitis
 cutaneous vasculitis in vasculitis syndromes

• pulmonary Wegener granulomatosis
• Churg-Strauss syndrome (Churg-Strauss angiitis and granulomatosis)
• microscopic polyangiitis
• necrotizing sarcoid granulomatosis
• polyarteritis nodosa
• small cell vasculitis
• giant cell arteritis
• Takayasu arteritis
• Behcet syndrome
• Henoch-Schönlein purpura
• cryoglobulinemic vasculitis
• hypocomplementemic vasculitis
• giant cell arteritis
• disseminated visceral giant cell angiitis

 vascular involvment in lymphoproliferative disorders

• angiocentric immunoproliferative lesions
  • lymphomatoid granulomatosis (B-cell proliferation)
  • non-Hodgkin lymphomas
    • intravascular lymphoma