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Differentiating malignant from benign hyperintense nodules on unenhanced T1-weighted images in patients with chronic liver disease: using gadoxetic acid-enhanced and diffusion-weighted MR imaging

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Abstract

Purpose

To evaluate value of gadoxetic acid-enhanced and diffusion-weighted (DW) MRI for distinguishing malignant from benign hyperintense nodules on unenhanced T1-weighted images (T1WIs) in patients with chronic liver disease.

Materials and methods

Forty-two patients with 37 malignant and 41 benign hyperintense nodules on unenhanced T1WIs who underwent gadoxetic acid-enhanced and DW MRI, followed by histopathological examination, were included. Qualitative and quantitative analyses were conducted. Significant findings on univariate and multivariate analyses were identified and their diagnostic performances were analyzed for predicting hyperintense hepatocellular carcinomas (HCCs).

Results

In univariate analysis, hyperintensity on T2WI, arterial enhancement, washout, hypointensity on hepatobiliary phase, and diffusion restriction were more frequently observed (P < 0.05) in hyperintense HCCs. Tumor-to-liver SI ratio on hepatobiliary phase and minimum apparent diffusion coefficient (ADCmin) were significantly lower in hyperintense HCCs (P < 0.05). In multivariate analysis, hyperintensity on T2WI (OR, 13.58; P = 0.02), arterial enhancement (OR, 8.21; P = 0.002), and ADCmin ≤ 0.83 × 10−3 mm2/s (OR, 6.88; P = 0.008) were independently significant factors for predicting hyperintense HCCs. When two of three criteria were combined, 75.7% (28/37) of hyperintense HCCs were identified with a specificity of 92.7%, and when all three criteria were satisfied, the specificity was 97.6%.

Conclusion

Gadoxetic acid-enhanced and DW MRI may be helpful for differentiating malignant from benign hyperintense nodules on unenhanced T1WI.

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Abbreviations

DW:

Diffusion weighted

T1WI:

T1-weighted image

T2WI:

T2-weighted image

SI:

Signal intensity

CEI:

Contrast enhancement index

ADC:

Apparent diffusion coefficient

OR:

Odds ratio

MR:

Magnetic resonance

HCC:

Hepatocellular carcinoma

AFP:

Alpha-fetoprotein

ROI:

Region of interest

ROC:

Receiver operating characteristic

PPV:

Positive predictive value

NPV:

Negative predictive value

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This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.

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Correspondence to Seong Hyun Kim.

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The authors declare that there is no conflict of interest.

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All applicable institutional and/or national guidelines for the care and use of animals were followed.

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Moon, J.Y., Kim, S.H., Choi, SY. et al. Differentiating malignant from benign hyperintense nodules on unenhanced T1-weighted images in patients with chronic liver disease: using gadoxetic acid-enhanced and diffusion-weighted MR imaging. Jpn J Radiol 36, 489–499 (2018). https://doi.org/10.1007/s11604-018-0748-x

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  • DOI: https://doi.org/10.1007/s11604-018-0748-x

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