Measurement of maximum outer diameter of the normal appendix on CT.

In the top left side viewport the appendix was visualized along its complete length. Here the reader looked for the image truly perpendicular to the axis of the appendix, which corresponded to the maximal outer diameter as seen in the left bottom side viewport. The maximal outer diameter of the appendix was measured in the bottom left side viewport. In the top right side viewport, the appendix was seen as a linear structure.