Eosinophilic granulomatosis with polyangiitis (EGPA), formerly known as Churg-Strauss syndrome (CSS), is a subtype of small-to medium-sized vessel anti-neutrophil cytoplasmic antibody ...

Etiology: The cause of granuloma annulare is unknown. Granuloma annulare can occur at any age, but is seen predominantly in children and young adults. It occurs more frequently in females than males.

The pathology of WG/GPA is characteristically described as a granulomatous necrotizing inflammation and pauci-immune vasculitis of the small- to medium-sized blood vessels (Figure 1). WG/GPA can ...