Added value of ratio of cross diameters of the appendix in ultrasound diagnosis of acute appendicitis

Figure 1 A normal appendix. A: On the longitudinal view, the appendix appears as a blind-ending structure extending from the cecum in the abdominal cavity, the mural structures are clearly visible, there is no filling in the lumen, and the mucosa appears slightly hyperechoic with a thread-like appearance; B: On the transverse view, the appendix appears as an ovoid shape, the mural structures are visible, there is no filling in the lumen, and the ratio of the cross diameters on the transverse section is 5.9/5.3 = 1.11. Subsequent ultrasound examination revealed that the patient had a right ureter stone (not shown).