Use of the vertebrae and iliac bone as references for localizing the appendix vermiformis in computed tomography

Figure 1 Determining the localization of the highest point of the appendix using the vertebrae as a reference. A: The highest point of the appendix vermiformis is detected (orange arrow) on axial images; B: Subsequently, the highest point is verified on coronal images (orange arrow); C: The highest point (orange arrow) is marked on axial images with reference lines; D and E: The vertebral level of the marked point is determined using coronal and sagittal thick multiplanar reconstruction images, respectively, with bone window settings. Subsequently, the same assessment is conducted to identify the lowest point of the appendix. L: Lumbar vertebra; S: Sacral vertebra.