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Representative images showing the appearance of AI and OBS on CECT. A The AI in the parenchymal phase was defined as an angle of 90° or less (black lines). (B) A contact length ≥ 3 mm of the bulging portion of the renal tumor onto the renal surface was indicative of a positive OBS (black arrows). AI, angular interface; OBS, overflowing beer sign; CECT, contrast-enhanced computed tomography
