Journal of Gastroenterology

, Volume 40, Issue 7, pp 744–751

Mode of progression of intraductal papillary-mucinous tumor of the pancreas: analysis of patients with follow-up by EUS

  • Go Kobayashi
  • Naotaka Fujita
  • Yutaka Noda
  • Kei Ito
  • Jun Horaguchi
  • Osamu Takasawa
  • Satoshi Akaishi
  • Takashi Tsuchiya
  • Masao Kobari
Article

Abstract

Background

We investigated the mode of progression of intraductal papillary-mucinous neoplasm of the pancreas (IPMN) in patients who underwent follow-up in order to elucidate the characteristics of malignancy and to establish an effective treatment strategy.

Methods

Fifty-one patients with IPMN (branch-duct type, 47; main-duct type, 4) who had undergone follow-up study by endoscopic ultrasonography (EUS) were included (mean follow-up duration, 41.0 ± 32.3 months; average number of EUS examinations performed during follow-up, 4.4). Chronological changes in EUS findings and histological findings of resected specimens were evaluated.

Results

Of the patients with the branch-duct type, only 2% showed enlargement of the dilated branches. In the main-duct-type group, an increase in size of the main pancreatic duct (MPD) was observed in 75% of the patients. In 14 patients with papillary protrusions, an increase in size and lateral spread was observed in 71% and 43%, respectively. No patients developed invasive cancer. In 15 patients who had thick septum-like structures (TSS), the development of papillary protrusions and that of invasive cancer were observed in 53% and 13%, respectively. Twenty-nine patients who had thin septum-like structures showed no change. Two patients with dense multilocular large cysts and TSS developed invasive cancer without change in the cystic lesions. One patient developed carcinoma with multifocal stromal invasion.

Conclusions

Patients with branch-duct type IPMNs without papillary protrusions or TSS are not immediate candidates for surgery. Those who have small papillary protrusions have a benign course. It is recommended that patients with the large branch-duct type with TSS should undergo surgery. Attention should be paid to the entire pancreas when performing follow-up examinations in patients with branch-duct type IPMN, as invasive ductal adenocarcinoma can develop at a site in the pancreas different from that of the IPMN.

Key words

intraductal papillary-mucinous neoplasm endoscopic ultrasonography pancreatic tumor natural history 

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Copyright information

© Springer-Verlag Tokyo 2005

Authors and Affiliations

  • Go Kobayashi
    • 1
  • Naotaka Fujita
    • 1
  • Yutaka Noda
    • 1
  • Kei Ito
    • 1
  • Jun Horaguchi
    • 1
  • Osamu Takasawa
    • 1
  • Satoshi Akaishi
    • 2
  • Takashi Tsuchiya
    • 2
  • Masao Kobari
    • 2
  1. 1.Department of GastroenterologySendai City Medical CenterSendaiJapan
  2. 2.Department of SurgerySendai City Medical CenterSendaiJapan

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