Fig. 4From: Can lymphovascular invasion be predicted by contrast-enhanced CT imaging features in patients with esophageal squamous cell carcinoma? A preliminary retrospective studyThe GTV of the tumor was obtained by using 3D Slicer software. a, b The GTV was derived from a patient with LVI in Fig. 2. The GTV was 20.60 cm3 with an irregular tumor margin. c, d The GTV was derived from a patient without LVI in Fig. 3. The GTV was 5.06 cm3 with a regular tumor marginBack to article page