Evaluation of the guidelines for management of pancreatic branch-duct intraductal papillary mucinous neoplasm

Abstract

Background & aims: The 2006 Sendai Consensus Guidelines recommend surgical resection for all suspected branch-duct intraductal papillary mucinous neoplasm (BD-IPMN) greater than 3 cm irrespective of symptoms, and those less than 3 cm with worrisome features. We aimed to evaluate the surgical characteristics of these guidelines retrospectively in pathologically confirmed cases of BD-IPMN.

Methods: IPMNs resected at our institution (1995-2006) were classified as main-duct predominant or branch-duct (BD) predominant based on preoperative imaging and postoperative histology. Resected BD-IPMNs were classified histologically: low risk (adenoma, borderline) and high risk (carcinoma in situ or invasive cancer). Clinical data (presence of symptoms, mural nodule, dilated pancreatic duct, and cyst size) were correlated with pathology.

Results: Between 1995 and 2006, there were 204 patients who underwent surgical resection of pancreatic cysts. Sixty-one patients had IPMN including 31 with BD-IPMN. A total of 74.2% (23 of 31) of BD-IPMNs would have been recommended for surgical resection including 69.2% (18 of 26) of low-risk lesions and 100% (5 of 5) of high-risk lesions. All 8 cases of BD-IPMN that would have been recommended for nonsurgical management were low-risk lesions. The positive predictive value of the guidelines is 21.7% (95% confidence interval, 9.7%-41.9%). The negative predictive value is 100% (95% confidence interval, 67.6%-100.0%). Between 2000 and 2007, 351 patients with likely BD-IPMN were evaluated but not resected.

Conclusions: Implementation of the Consensus Guidelines to our single-institution, referral-based, surgical BD-IPMN population would have recommended resection of all histologically high-risk lesions. All lesions recommended for nonsurgical management were histologically low-risk lesions. For presumed BD-IPMNs less than 3 cm, the application of the Consensus Guidelines may reduce the resection rate for low-risk lesions.