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Comparative Study of the Diagnostic Ability of Magnetic Resonance Imaging and Multidetector Row Computed Tomography for Anomalous Pancreaticobiliary Ductal Junction

Nakamoto, Atsushi MD*; Kim, Tonsok MD, PhD*; Hori, Masatoshi MD, PhD*; Onishi, Hiromitsu MD, PhD*; Nakaya, Yasuhiro MD, PhD; Tsuboyama, Takahiro MD*; Tatsumi, Mitsuaki MD, PhD*; Tomoda, Kaname MD, PhD*

Journal of Computer Assisted Tomography: September-October 2010 - Volume 34 - Issue 5 - p 725-731
doi: 10.1097/RCT.0b013e3181e23ff2
Abdominal Imaging

Objective: To compare the diagnostic performance of magnetic resonance (MR) imaging and multidetector row computed tomography (MDCT) for an anomalous pancreaticobiliary ductal junction (PBJ).

Methods: This study included 26 patients who underwent MR imaging, MDCT, and endoscopic retrograde cholangiopancreatography. Seventeen of the patients were diagnosed by endoscopic retrograde cholangiopancreatography as having an anomalous PBJ. Three radiologists independently reviewed MR images alone, contrast-enhanced CT images alone, and MR images and CT images combined. Receiver operating characteristic curve analysis was used to compare diagnostic capabilities.

Results: The mean area under the receiver operating characteristic curve (Az [95% confidence interval]) was 0.75 (0.73-0.77) for MR imaging alone, 0.79 (0.70-0.89) for CT alone, and 0.84 (0.82-0.86) for the 2 modalities combined. Only between the combination and MR imaging alone was there significant difference in Az value (P < 0.05).

Conclusions: The diagnostic performance of MR imaging and MDCT was equivalent for an anomalous PBJ. The addition of MDCT to MR imaging improved the diagnostic performance.

From the *Department of Radiology, Osaka University Graduate School of Medicine, Osaka; and †Department of Radiology, Nishinomiya Municipal Central Hospital, Hyogo, Japan.

Received for publication January 19, 2010; accepted April 8, 2010.

Reprints: Atsushi Nakamoto, MD, Department of Radiology, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka 565-0871, Japan (e-mail:

The authors have no funding information to disclose.

© 2010 Lippincott Williams & Wilkins, Inc.