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Intraindividual Comparison of Hepatocellular Carcinoma Washout between MRIs with Hepatobiliary and Extracellular Contrast Agents

Korean Journal of Radiology 2021년 22권 5호 p.725 ~ 734
김연윤, 김영곤, 민지혜, 차동익, 김종만, 최규성, 안수현,
소속 상세정보
김연윤 ( Kim Yeun-Yoon ) - Sungkyunkwan University School of Medicine Samsung Medical Center Department of Radiology
김영곤 ( Kim Young-Kon ) - Sungkyunkwan University School of Medicine Samsung Medical Center Department of Radiology
민지혜 ( Min Ji-Hye ) - Sungkyunkwan University School of Medicine Samsung Medical Center Department of Radiology
차동익 ( Cha Dong-Ik ) - Sungkyunkwan University School of Medicine Samsung Medical Center Department of Radiology
김종만 ( Kim Jong-Man ) - Sungkyunkwan University School of Medicine Samsung Medical Center Department of Surgery
최규성 ( Choi Gyu-Seong ) - Sungkyunkwan University School of Medicine Samsung Medical Center Department of Surgery
안수현 ( Ahn Soo-Hyun ) - Ajou University Department of Mathematics

Abstract


Objective: To intraindividually compare hepatocellular carcinoma (HCC) washout between MRIs using hepatobiliary agent (HBA) and extracellular agent (ECA).

Materials and Methods: This study included 114 prospectively enrolled patients with chronic liver disease (mean age, 55 ± 9 years; 94 men) who underwent both HBA-MRI and ECA-MRI before surgical resection for HCC between November 2016 and May 2019. For 114 HCCs, the lesion-to-liver visual signal intensity ratio (SIR) using a 5-point scale (?2 to +2) was evaluated in each phase. Washout was defined as negative visual SIR with temporal reduction of visual SIR from the arterial phase. Illusional washout (IW) was defined as a visual SIR of 0 with an enhancing capsule. The frequency of washout and MRI sensitivity for HCC using LR-5 or its modifications were compared between HBA-MRI and ECA-MRI. Subgroup analysis was performed according to lesion size (< 20 mm or ≥ 20 mm).

Results: The frequency of portal venous phase (PP) washout with HBA-MRI was comparable to that of delayed phase (DP) washout with ECA-MRI (77.2% [88/114] vs. 68.4% [78/114]; p = 0.134). The frequencies were also comparable when IW was allowed (79.8% [91/114] for HBA-MRI vs. 81.6% [93/114] for ECA-MRI; p = 0.845). The sensitivities for HCC of LR-5 (using PP or DP washout) were comparable between HBA-MRI and ECA-MRI (78.1% [89/114] vs. 73.7% [84/114]; p = 0.458). In HCCs < 20 mm, the sensitivity of LR-5 was higher on HBA-MRI than on ECA-MRI (70.8% [34/48] vs. 50.0% [24/48]; p = 0.034). The sensitivity was similar to each other if IW was added to LR-5 (72.9% [35/48] for HBA-MRI vs. 70.8% [34/48] for ECA-MRI; p > 0.999).

Conclusion: Extracellular phase washout for HCC diagnosis was comparable between MRIs with both contrast agents, except for tumors < 20 mm. Adding IW could improve the sensitivity for HCC on ECA-MRI in tumors < 20 mm.

키워드

Gadoxetic acid; Extracellular contrast; Magnetic resonance imaging; Hepatocellular carcinoma; Washout

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