A case of pancreatic pseudocysts accompanied by infection, pseudoaneurysm ruptures, and pseudocystocolonic fistulae

  • Kosuke Sato
  • Kazuya TakahashiEmail author
  • Yukio Aruga
  • Fusako Yamazaki
  • Daisuke Kumaki
  • Masashi Yamakawa
  • Masaaki Hirano
  • Kazuhiro Funakoshi
  • Shuji Terai
Case Report


Pancreatic pseudocysts (PPs) can be accompanied by infection, pseudoaneurysm ruptures, and fistulae to other organs, which can be fatal without appropriate treatment. Herein, we present the case of an 82-year-old man with PPs accompanied by infection, pseudoaneurysm rupture, and pseudocystocolonic fistula that were managed via multidisciplinary treatment. Computed tomography (CT) revealed two inflamed PPs, one each in the pancreatic head and tail. He was, therefore, diagnosed with infectious PPs. The pancreatic head PP shrunk on endoscopic nasopancreatic drainage (ENPD), but the pancreatic tail PP did not. Endoscopic ultrasound (EUS)-guided transluminal drainage was performed to treat the pancreatic tail PP; his symptoms improved. However, he vomited blood at 14 day post-drainage. Angiography revealed pseudoaneurysm rupture in a left gastric artery branch. After successful angioembolization, he developed hematochezia 2 days later. We suspected re-bleeding of the pseudoaneurysm. The bleeding stopped spontaneously, but CT and radiography revealed the presence of a pseudocystocolonic fistula. Careful follow-up was performed, and he has not had any symptoms at 9 month post-discharge. We managed PP-related complications via ENPD, EUS-guided transluminal drainage, angioembolization, and careful follow-up. Infection, pseudoaneurysm rupture, and pseudocystocolonic fistula are rare, but can occur simultaneously. Therefore, clinicians should consider these complications when treating patients with PPs.


Pancreatic pseudocyst Infection Pseudocystocolonic fistula Pseudoaneurysm 



We thank Dr. Yoshinori Kihara and Dr. Yuzuru Okuizumi in the department of radiology, Niigata Prefectural Central Hospital for a technical support.

Author contributions

Drafting of the paper: KS; critical revision of the manuscript: KT; revision of the manuscript: YA and ST; and technical support: FY, DK, MY, MH, and KF.


No funding to disclose.

Compliance with ethical standards

Conflict of interest

None of the authors have a conflict of interest.

Human/animal rights

All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008(5).

Ethics approval

Ethical approval was not required.

Informed consent

Written informed consent was obtained from the patient.


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Copyright information

© Japanese Society of Gastroenterology 2019

Authors and Affiliations

  1. 1.Department of Internal MedicineNiigata Prefectural Central HospitalJoetsuJapan
  2. 2.Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental SciencesNiigata UniversityNiigataJapan

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