fig2

Figure 2. Illustration of US-FLI criteria and metrics: vessels blurring, focal sparing, and visualization of gallbladder wall. Normal appearance, with optimal visualization, of contours and lumen (highlighted with arrow) of hepatic veins (panel A). This semeiotics would receive a US-FLI score = 0. Conversely, impaired visualization of contours and lumen of hepatic veins would be assigned a US-FLI score = 1 (panel B). Panel C shows normal appearance of walls of portal branches (highlighted with an arrow) which would receive a US-FLI score = 0 and normal visualization of the gallbladder wall (highlighted with a dotted arrow) which is assigned a US-FLI score = 0. Impaired visibility of walls of portal branches (highlighted with an arrow) would receive a US-FLI score = 1 (panel D). An area of focal sparing (highlighted with an arrow) would be assigned a US-FLI score = 1 (panel E). Impaired visualization of wall of gallbladder (highlighted with a dotted arrow) is assigned a US-FLI score = 1 (panel F). Reproduced with permission from Ballestri et al.^[9]. US-FLI: Ultrasonographic fatty liver indicator.