Figure 11b. Hepatic VOD following hematopoietic stem cell transplantation. (a) Right upper quadrant US image demonstrates ascites and marked gallbladder wall thickening (cursors). (b) Doppler US images obtained in a more severely affected transplant recipient show pulsatile hepatofugal portal venous flow (top) and reduced diastolic hepatic arterial flow (bottom) indicated by an elevated resistive index (>0.8).