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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