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Gastrointestinal Imaging |
1 From the Departments of Radiology (H.K.H., I.S., H.V.N., R.C.C., W.J.W., I.R.F.) and Biostatistics (T.D.J.), University of Michigan Hospitals, 1500 E Medical Center Dr, MRI B2B311, Ann Arbor, MI 48109-0030. From the 2001 RSNA scientific assembly. Received July 26, 2002; revision requested September 10; final revision received July 3, 2003; accepted July 31. Address correspondence to H.K.H. (e-mail: hhussain@umich.edu).
PURPOSE: To assess if T2-weighted magnetic resonance (MR) imaging provides added diagnostic value in combination with dynamic gadolinium-enhanced MR imaging in the detection and characterization of nodular lesions in cirrhotic liver.
MATERIALS AND METHODS: Two readers retrospectively and independently analyzed 54 MR imaging studies in 52 patients with cirrhosis. In session 1, readers reviewed T1-weighted and dynamic gadolinium-enhanced images. In session 2, readers reviewed T1-weighted, dynamic gadolinium-enhanced, and respiratory-triggered T2-weighted fast spin-echo images. Readers identified and characterized all focal lesions by using a scale of 14 (1, definitely benign; 4, definitely malignant). Multireader correlated receiver operating characteristic (ROC) analysis was employed to assess radiologist performance in session 2 compared with session 1. The difference in the areas under the ROC curves for the two sessions was tested. In a third session, readers assessed conspicuity of biopsy-proved lesions on T2-weighted MR images by using a scale of 13 (1, not seen; 3, well seen) and identified causes of reduced conspicuity.
RESULTS: Two additional benign lesions were detected by each reader in session 2. Fifty-five lesions had pathologic verification, including 32 malignant, three high-grade dysplastic, and 20 benign nodules. There was no significant difference in the area under the ROC curves between the two sessions (P = .48). Thirty-two lesions were inconspicuous on T2-weighted MR images because of parenchymal heterogeneity, breathing artifacts (particularly in patients with ascites), and lesion isointensity with liver parenchyma. T2-weighted MR imaging was useful in the evaluation of cysts and lymph nodes.
CONCLUSION: T2-weighted MR imaging does not provide added diagnostic value in the detection and characterization of focal lesions in cirrhotic liver.
© RSNA, 2004
Index terms: Liver, cirrhosis, 761.288 Liver neoplasms, 761.31, 761.323, 761.33 Liver neoplasms, MR, 761.121411, 761.121412, 761.121413, 761.121415, 761.12143
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