Effectiveness of ADC histogram analysis in the diagnosis of focal liver lesions; is a contrast agent necessary?

Year 2022, , 187 - 195, 30.05.2022

Ahmet Tanyerı Mehmet Burak Cıldag Omer Faruk Kutsi Koseoglu

https://doi.org/10.5472/marumj.1121815

Abstract

Objective: The diagnostic success of apparent diffusion coefficient (ADC) histogram analysis in focal liver lesions, and the effects
of quantitative data added to contrast-enhanced abdominal magnetic resonance imaging (MRI) on the diagnostic accuracy were
investigated.

Materials and Methods: The conventional MRI findings of 524 lesions in total were retrospectively examined. Contrast enhancement
kinetics and ADC values for each lesion were found through an image analysis software.

Results: Three hundred and fifty (67%) of the lesions were diagnosed as benign and 174 (33%) as malignant. Statistically significant
difference was found between the benign and malignant lesion groups in terms of the minimum, maximum and mean ADC values
(p<0.001). When optimal thresholds for minimum, maximum and mean ADC were taken as 1.47x10-3mm2/s; 1.85x10-3mm2/s;
1.72x10-3mm2/s respectively, sensitivity was found to be 97%; 83%; 95%, specificity was 100%; 98%; 99%, NPV was 100%; 99%;
99%, and PPV was 93%; 74%; 90%. ADC values added to MRI increased the diagnostic success for metastases (92%→96%), HCC
(63%→73%), hemangioma (90%→99%) and FNH (56%→75%).

Conclusion: ADC measurement could not show reasonable success in the diagnosis of specific lesions while being successful in the
differentiation of benign and malignant lesions. Minimum ADC is more successful than mean and maximum ADC. A non-contrastenhanced
MRI protocol based on the ADC measurement applicable to the selected patient group may be helpful.

Keywords

Contrast agent, Liver lesions, Diffusion weighted imaging (DWI), Apparent diffusion coefficient (ADC)

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