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Imaging: EUS and IDUS

  • Itaru Naitoh
  • Takahiro Nakazawa
  • Hirotaka Ohara
  • Takashi Joh
Chapter

Abstract

EUS is an important procedure for the differential diagnosis of type 1 autoimmune pancreatitis (AIP) from other pancreatic diseases because IgG4-SC is often associated with type 1 AIP. Bile duct wall thickening is considered the EUS finding of IgG4-SC with type 1 AIP. Cholangiocarcinoma (CCA) and primary sclerosing cholangitis (PSC) are important diagnoses that should be differentiated from IgG4-SC. IDUS findings of non-stricture bile duct lesions are different between IgG4-SC and CCA. The thickening of the bile duct wall in non-stricture lesion is the most characteristic IDUS finding of IgG4-SC. The IDUS findings of stricture lesions are also different between IgG4-SC and PSC. IDUS is a useful modality for differentiating IgG4-SC from CCA and PSC, as the details of bile duct wall thickening are easily observable.

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Copyright information

© Springer Science+Business Media Singapore 2019

Authors and Affiliations

  • Itaru Naitoh
    • 1
  • Takahiro Nakazawa
    • 2
  • Hirotaka Ohara
    • 3
  • Takashi Joh
    • 1
  1. 1.Department of Gastroenterology and MetabolismNagoya City University Graduate School of Medical SciencesNagoyaJapan
  2. 2.Department of GastroenterologyNagoya Daini Red Cross HospitalNagoyaJapan
  3. 3.Department of Community-based Medical EducationNagoya City University Graduate School of Medical SciencesNagoyaJapan

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