Fig. 2. Type I: patent true and false lumens revealing entry and re-entry sites; Type II: ‘cul-de-sac’-shaped false lumen without re-entry; Type IIa: Visible false lumen but no visible re-entry site (blind pouch of false lumen); Type IIb: No visible false luminal flow (thrombosed false lumen); Type III: SMA dissection with occlusion of SMA. SMA: superior mesenteric artery.