Guidance for diagnosing autoimmune pancreatitis with biopsy tissues

Kenji Notohara, Terumi Kamisawa, Noriyoshi Fukushima, Toru Furukawa, Takuma Tajiri, Hiroshi Yamaguchi, Shinichi Aishima, Yuki Fukumura, Kenichi Hirabayashi, Eisuke Iwasaki, Atsushi Kanno, Satomi Kasashima, Atsuhiro Kawashima, Motohiro Kojima, Kensuke Kubota, Yasuhiro Kuraishi, Tomoko Mitsuhashi, Yoshiki Naito, Itaru Naitoh, Hiroshi NakaseTakayoshi Nishino, Nobuyuki Ohike, Junichi Sakagami, Kyoko Shimizu, Masahiro Shiokawa, Takeshi Uehara, Tsukasa Ikeura, Shigeyuki Kawa, Kazuichi Okazaki

Research output: Contribution to journalReview articlepeer-review

7 Citations (Scopus)

Abstract

The biopsy-based diagnosis of autoimmune pancreatitis (AIP) is difficult but is becoming imperative for pathologists due to the increased amount of endoscopic ultrasound-guided biopsy tissue. To cope with this challenge, we propose guidance for the biopsy diagnosis of type 1 AIP. This guidance is for pathologists and comprises three main parts. The first part includes basic issues on tissue acquisition, staining, and final diagnosis, and is intended for gastroenterologists as well. The second part is a practical guide for diagnosing type 1 AIP based on the AIP clinical diagnostic criteria 2018. Inconsistent histological findings, tips for evaluating IgG4 immunostaining and key histological features including the ductal lesion and others are explained. Storiform fibrosis and obliterative phlebitis are diagnostic hallmarks but are sometimes equivocal. Storiform fibrosis is defined as spindle-shaped cells, inflammatory cells and fine collagen fibers forming a flowing arrangement. Obliterative phlebitis is defined as fibrous venous obliteration with inflammatory cells. Examples of each are provided. The third part describes the differentiation of AIP from pancreatic ductal adenocarcinoma (PDAC), focusing on histological features of acinar-ductal metaplasia in AIP, which is an important mimicker of PDAC. This guidance will help standardize pathology reports of pancreatic biopsies for diagnosing type 1 AIP.

Original languageEnglish
Pages (from-to)699-711
Number of pages13
JournalPathology international
Volume70
Issue number10
DOIs
Publication statusPublished - 2020 Oct 1

Keywords

  • IgG4-related disease
  • autoimmune pancreatitis
  • biopsy
  • endoscopic ultrasound-guided fine needle aspiration
  • immunohistochemistry
  • pancreatic carcinoma
  • pathology

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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