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Intraductal papillary mucinous neoplasms of the pancreas showing fistula formation into other organs

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

Background

This study assessed the mechanism of fistula formation in intraductal papillary mucinous neoplasm (IPMN) of the pancreas.

Methods

A total of 274 patients with IPMN who had been diagnosed by endoscopic retrograde cholangiopancreatography and endoscopic ultrasonography (EUS) at our center were enrolled. The patients with IPMN which had fistula formation into other organs were investigated retrospectively as to (1) clinical prevalence and the organs penetrated by IPMN, (2) analysis of the mechanism of fistula formation by immunohistopathological study, (3) efficacy of EUS in progression assessment, and (4) prognosis.

Results

Among the subjects, fistula formation into other organs was observed in 18 patients (6.6%) and into 28 organs. There were 7 patients (39%) in whom multiple organs were penetrated. Of 16 patients who had undergone investigation of the expression of mucin markers, 94% had an intestinal-type tumor. Of 9 patients who had undergone surgery or autopsy, 67% showed mechanical penetration without invasion around the fistula. Only papillary protrusions were seen by EUS in 4 of these patients with noninvasive papillary adenocarcinoma showing mechanical penetration. All 5 patients who had pancreatic parenchymal invasion showed a mass with a mixed-echo pattern in addition to papillary protrusions shown by EUS, corresponding to colloid carcinoma.

Conclusions

There were 2 processes in the development of fistulas in IPMN. Of those patients showing fistula formation, 94% had intestinal-type IPMN, and 67% showed mechanical penetration. Delineation of a mass with the mixed-echo pattern suggested an invasive penetration due to colloid carcinoma.

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Authors and Affiliations

  1. Department of Gastroenterology, Sendai City Medical Center, 5-22-1 Tsurugaya, Miyagino-ku, Sendai, Miyagi, 983-0824, Japan

    Go Kobayashi, Naotaka Fujita, Yutaka Noda, Kei Ito, Jun Horaguchi, Takashi Obana, Shinsuke Koshida, Yoshihide Kanno, Yasunobu Yamashita, Yuhei Kato & Takahisa Ogawa

  2. Department of Surgery, Sendai City Medical Center, Sendai, Japan

    Masaya Oikawa & Takashi Tsuchiya

  3. First Department of Pathology, Iwate Medical University School of Medicine, 19-1 Uchimaru, Morioka, Iwate, 020-8505, Japan

    Takashi Sawai

Authors
  1. Go Kobayashi
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  2. Naotaka Fujita
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  3. Yutaka Noda
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  4. Kei Ito
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  5. Jun Horaguchi
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  11. Takahisa Ogawa
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  12. Masaya Oikawa
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Correspondence to Go Kobayashi.

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Kobayashi, G., Fujita, N., Noda, Y. et al. Intraductal papillary mucinous neoplasms of the pancreas showing fistula formation into other organs. J Gastroenterol 45, 1080–1089 (2010). https://doi.org/10.1007/s00535-010-0263-z

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  • DOI: https://doi.org/10.1007/s00535-010-0263-z

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