Skip to main content
Fig. 2 | Insights into Imaging

Fig. 2

From: Value of preoperative computed tomography for meso-Rex bypass in children with extrahepatic portal vein obstruction

Fig. 2Fig. 2

Computed tomography classification of the Rex recess. a Type 1. The Rex recess is widened, and the diameter is ≥ 5 mm (13.8 mm in this figure). b Type 2. The Rex recess is clear and can be measured, and the diameter is ≥ 2 to < 5 mm (3.8 mm in this figure). c, d Type 3. The Rex recess is faintly visible and < 2 mm in diameter, or the border with the side branches is unclear, but the segment III branch can be distinguished by computed tomography. c1, c2 The diameter of the Rex recess is < 2 mm (1.3 mm in delayed phase imaging). c2 Note the thickened left hepatic artery in the arterial phase imaging of c1. d1, d2 The Rex recess cannot be distinguished from the thickened left hepatic artery (d1), but the branch of segment III can be found in d2. e, f Type 4. The Rex recess cannot be distinguished by computed tomography. e1, e2 The Rex recess cannot be distinguished from the thickened left hepatic artery and cannot be confirmed in the branch of segment III. f1, f2 Complete loss of vascular landmarks of the Rex recess. g Diagram of the meso-Rex bypass procedure. Abbreviations: US, ultrasound; CT, computed tomography; MR, magnetic resonance imaging; EHPVO, extrahepatic portal vein obstruction; MRB, meso-Rex bypass; and WHVP, wedged hepatic vein portography

Back to article page