Abbreviated MRI for hepatocellular carcinoma screening: A systematic review and meta-analysis

Background & Aims: Biannual ultrasound has poor sensitivity for hepatocellular carcinoma (HCC) screening. MRI is accurate for the detection of HCC, but a complete MRI is not feasible as a screening tool. Abbreviated MRI (AMRI) is an acceptable alternative. The diagnostic performance of different AMRI protocols is not known. We performed a systematic review to determine the diagnostic accuracy of AMRI for HCC screening. Methods: We searched the MEDLINE and EMBASE databases for studies reporting the diagnostic accuracy of AMRI for HCC screening. The pooled sensitivity and specificity of different AMRI protocols were calculated based on a random intercept logistic regression model. The diagnostic performance of AMRI was compared with ultrasound. Study quality was assessed using the QUADAS-2 tool. Results: Of the 11,327 studies screened by titles, 15 studies (3 prospective and 12 retrospective: 2,807 patients, 917 with HCC) were included in the final analysis. The pooled per-patient sensitivity and specificity were 86% (95% CI 84-88%, I-2 0%) and 94% (95% CI 91-96%, I-2 83%), respectively. Pooled per-lesion sensitivity was 77% (95% CI 74-81%, I-2 8%). There was no influence of study type, screening setting, reference standard, and presence and etiology of cirrhosis on the performance of AMRI. The sensitivity of AMRI for detection of HCC <2 cm was lower than that for HCC >- 2 cm (69% vs. 86%). The sensitivity and specificity of non-contrast AMRI were comparable to contrast-enhanced AMRI (86% and 94% vs. 87% and 94%, respectively). The diagnostic performance of different non-contrast AMRI and contrast-enhanced AMRI protocols was comparable. The sensitivity of ultrasound was lower than AMRI (53% vs. 82%). Conclusions: AMRI has high sensitivity and specificity for HCC screening. Different AMRI protocols have comparable diagnostic performance. Lay summary: Abbreviated MRI (AMRI) has been suggested as an alternative to ultrasound and complete MRI for hepatocellular carcinoma (HCC) screening. Our study results showed that AMRI has a high per-patient and per-lesion sensitivity for HCC. Although the sensitivity of AMRI for detection of HCC <2 cm is considerably lower than for HCC>-2 cm, it is substantially higher than ultrasound, making it a potential alternative for HCC screening in high-risk populations. (C) 2021 European Association for the Study of the Liver. Published by Elsevier B.V. All rights reserved.

Automated summary

Abbreviated MRI (AMRI) is suggested as an alternative for hepatocellular carcinoma (HCC) screening. Our study showed that AMRI has high sensitivity and specificity for HCC screening. Different AMRI protocols have comparable diagnostic performance.