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Added value of diffusion‐weighted imaging to MR cholangiopancreatography with unenhanced mr imaging for predicting malignancy or invasiveness of intraductal papillary mucinous neoplasm of the pancreas
Author(s) -
Kang Koung Mi,
Lee Jeong Min,
Shin CheongIl,
Baek Jee Hyun,
Kim Seung Ho,
Yoon Jeong Hee,
Han Joon Koo,
Choi Byung Ihn
Publication year - 2013
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.24022
Subject(s) - medicine , malignancy , intraductal papillary mucinous neoplasm , effective diffusion coefficient , radiology , diffusion mri , receiver operating characteristic , magnetic resonance imaging , magnetic resonance cholangiopancreatography , pancreas , nuclear medicine , endoscopic retrograde cholangiopancreatography , pathology , pancreatitis
Purpose: To investigate the added value of diffusion‐weighted imaging (DWI) to magnetic resonance cholangiopancreatography (MRCP) with unenhanced MR imaging for predicting the malignancy or invasiveness of intraductal papillary mucinous neoplasms (IPMNs). Materials and Methods: Following Institutional Review Board (IRB) approval, this retrospective study included 52 patients with surgically resected IPMNs and who underwent MRCP, unenhanced MRI, and DWI. Three blinded radiologists evaluated the two image sets, ie, MRCP with unenhanced MR images vs. the combined set with MRCP, unenhanced MR images, and DWI, and scored their confidence for malignancy or for invasiveness of IPMNs. The mean apparent diffusion coefficient (ADC) values of benign IPMNs and of intraductal mucinous carcinomas (IPMCs) were compared. The diagnostic accuracy was calculated using receiver operating characteristic (ROC) curve analysis. esults: The mean ADC of malignant IPMNs (2.05 ± 0.66 × 10 −3 mm 2 /sec) was significantly lower than that of benign IPMNs (2.95 ± 0.32 × 10 −3 mm 2 /sec, P < 0.0001). Invasive IPMCs (1.51 ± 0.32 × 10 −3 mm 2 /sec) showed significantly lower ADC than that of noninvasive IPMCs (2.67 ± 0.23 × 10 −3 mm 2 /sec, P = 0.0003). The area of diffusion restriction was more frequently seen in malignant IPMNs than in benign IPMNs ( P < 0.00001). The addition of DWI to MRCP with unenhanced MRI did not show a significant improvement for predicting malignant IPMN ( P > 0.05), but resulted in a tendency to improve the diagnostic accuracy for the prediction of invasive IPMN in two observers ( P = 0.072, P = 0.085). Conclusion: The addition of DWI to MRCP with unenhanced MRI may improve the diagnosis of malignant IPMN and further increase the prediction of invasive IPMC. J. Magn. Reson. Imaging 2013;38:555–563. © 2013 Wiley Periodicals, Inc.