Marked lymphoplasmacytic infiltration with fibrosis (A) and numerous IgG4‐positive plasma cells (B) in autoimmune pancreatitis. (A) The infiltration of plasma cells is easy to recognize. Eosinophils are also intermingled (hematoxylin and eosin stain). (B) More than ten positive cells in a high‐power field are identified (immunostaining for IgG4).
From: Notohara K, Kamisawa T, Fukushima N, et al. Guidance for diagnosing autoimmune pancreatitis with biopsy tissues. Pathol Int 2020; 70(10):699-711.
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