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Differentiation between autoimmune pancreatitis and pancreatic carcinoma based on endoscopic retrograde cholangiopancreatography findings

  • Original Article—Liver, Pancreas, and Biliary Tract
  • Published:
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Abstract

Objective

We have reviewed the endoscopic retrograde cholangiopancreatography (ERCP) images of patients with autoimmune pancreatitis (AIP) and pancreatic carcinoma (Pca) in an attempt to identify findings that would facilitate making a differential diagnosis between AIP and Pca.

Methods

The study cohort consisted of 39 patients diagnosed with AIP and 62 patients diagnosed with Pca. The ERCP findings in the pancreatic duct and biliary tract were compared between the two groups.

Results

The ERCP images revealed that AIP patients had a higher prevalence of narrowing of the main pancreatic duct (MPD) for ≥3 cm of its length and a higher prevalence for the presence of side branches in the narrowed portion of the MPD than Pca patients (p < 0.001 and p < 0.001, respectively). In contrast, the prevalence of an upstream MPD having a maximal diameter ≥4 cm was significantly higher in the Pca patient group (p < 0.001). The discriminant analysis identified three significant factors: (1) whether or not side branches were present; (2) total length of the narrowed portion of the MPD; (3) maximal diameter of the upstream MPD. It was impossible to differentiate Pca from AIP in the two Pca patients in whom ERCP revealed both narrowing of the MPD for >5 cm of its length and the presence of side branches.

Conclusions

Among our patient cohort, the ERCP findings in terms of the length of the narrowed portion of the MPD, the presence of side branches, and maximal diameter of the upstream MPD enabled differential diagnosis between AIP and Pca in most of the cases. However, it must be borne in mind that some Pca patients have ERCP findings similar to those of AIP patients.

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Authors and Affiliations

  1. Department of Gastroenterology, Yachiyo Medical Center, Tokyo Women’s Medical University, 477-96 Owada-Shinden, Yachiyo, Chiba, 276-8542, Japan

    Takayoshi Nishino

  2. Department of Clinical Laboratory, School of Medicine, Tokyo Women’s Medical University, Tokyo, Japan

    Hiroyasu Oyama

  3. Toki Clinic, Tokyo, Japan

    Fumitake Toki

  4. Institute of Gastroenterology, Department of Medicine, School of Medicine, Tokyo Women’s Medical University, Tokyo, Japan

    Keiko Shiratori

Authors
  1. Takayoshi Nishino
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  2. Hiroyasu Oyama
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  3. Fumitake Toki
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  4. Keiko Shiratori
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Correspondence to Takayoshi Nishino.

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Nishino, T., Oyama, H., Toki, F. et al. Differentiation between autoimmune pancreatitis and pancreatic carcinoma based on endoscopic retrograde cholangiopancreatography findings. J Gastroenterol 45, 988–996 (2010). https://doi.org/10.1007/s00535-010-0250-4

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  • DOI: https://doi.org/10.1007/s00535-010-0250-4

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