Figure 1

Figure 1

Open lung biopsy specimen from a patient with Churg-Strauss syndrome demonstrating the three main histological criteria originally described by Churg and Strauss. (A) Extravascular granulomas (arrowheads) are seen in association with an eosinophilic interstitial and alveolar infiltrate. (B) A higher power view highlights the necrotising vasculitic process (arrows).