Endoscopic ultrasonographic findings predict the risk of carcinoma in branch duct intraductal papillary mucinous neoplasms of the pancreas

Pancreatology. 2012 Mar-Apr;12(2):141-5. doi: 10.1016/j.pan.2011.12.008. Epub 2012 Jan 14.


Background: The preoperative diagnosis of branch duct intraductal papillary mucinous neoplasm (IPMN) of the pancreas can be very difficult, since low-risk and high-risk lesions can be difficult to differentiate even after cytological analysis. The purpose of this study was to evaluate the preoperative diagnostic value of endoscopic ultrasonography (EUS) in differentiating low-risk and high-risk IPMNs.

Methods: We retrospectively identified 36 patients who underwent preoperative EUS for branch duct IPMNs. The pathological diagnosis after surgical resection was low-grade dysplasia (n = 26), moderate dysplasia (n = 1), high-grade dysplasia or carcinoma in situ (n = 5), and invasive carcinoma (n = 4). We divided the patients into two groups: low risk (low-grade dysplasia or moderate dysplasia) and high risk (high-grade dysplasia or carcinoma). We focused on the diameter of the cystic dilated branch duct, the main pancreatic duct, and the mural nodule as measured using the EUS findings.

Results: The cystic dilated branch duct diameter (31.5 mm vs. 41.9 mm, P = 0.0225) was significantly correlated with low-risk and high-risk IPMNs, but the main pancreatic duct diameter (5.37 mm vs. 5.44 mm, P = 0.9418) was not significantly correlated with the low-risk and high-risk IPMNs. The mural nodule diameter of the papillary protrusions (4.3 mm vs. 16.4 mm, P < 0.0001) and the width diameter of the mural nodule (5.7 mm vs. 23.2 mm, P < 0.0001) were significantly correlated with low-risk and high-risk IPMNs.

Conclusions: The mural nodule of papillary protrusions diameter and width diameter observed using EUS was a reliable preoperative diagnostic finding capable of distinguishing low-risk and high-risk IPMNs.

MeSH terms

  • Adenocarcinoma, Mucinous / diagnosis*
  • Adenocarcinoma, Mucinous / diagnostic imaging
  • Adult
  • Aged
  • Carcinoma, Pancreatic Ductal / diagnosis*
  • Carcinoma, Pancreatic Ductal / diagnostic imaging
  • Carcinoma, Papillary / diagnosis*
  • Carcinoma, Papillary / diagnostic imaging
  • Diagnosis, Differential
  • Dilatation, Pathologic / diagnosis
  • Endosonography / methods*
  • Female
  • Humans
  • Male
  • Middle Aged
  • Pancreatic Ducts / pathology
  • Pancreatic Neoplasms / diagnosis*
  • Pancreatic Neoplasms / diagnostic imaging
  • Patient Selection
  • Precancerous Conditions / diagnosis
  • Predictive Value of Tests
  • Retrospective Studies