Storiform fibrosis (hematoxylin and eosin stain) in autoimmune pancreatitis. (A,B,C) Storiform fibrosis is characterized by a flowing arrangement of spindle‐shaped cells, inflammatory cells and delicate collagen as a unit (A,B). Ductal structures may be involved and acinar‐ductal metaplasia may be seen (arrows) (B). Although thick collagen strands (thick arrows) are atypical, a portion with the typical features (short arrows) allows for the diagnosis of storiform fibrosis (C).
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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