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Abstract #1696

Agreement of MRI Liver Observations Size Measurements and Impact on LIRADS v2017 categories (Determinant of size variability and Impact on LI-RADS v2017 category code)

Heejin Kwon1, Yong Eun Chung2, Min-Jeong Kim3, Sang Won Kim4, Guilherme M Cunha5, Tanya Wolfson5, and Claude B Sirlin5

1Dong-A University Hospital, Busan, Korea, Republic of, 2Yonsei University College of Medicine, Severance Hospital, Seoul, Korea, Republic of, 3Hallym University Sacred Heart Hospital, Anyang, Korea, Republic of, 4Kyung Hee University Hospital at Gangdong, Seoul, Korea, Republic of, 5Liver Imaging Group, UCSD Medical center, San Diego, CA, United States

While intra- and inter-observer agreement rates for size measurement is“excellent” for radiologists, variability across imaging phases could potentially impact LI-RADS categorization. Measurement variations were mostly seen across different postcontrast dynamic phases, as well as, related to specific imaging features (eg, presence of APHE and/or a capsule). In our opinion, the standardization of the most adequate imagingphase to perform size measurements of focal liver observations may increase thereproducibility of LI-RADS categories.

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