Which radiographic landmark is most reliable to evaluate the posteroanterior (PA) projection of the abdomen for rotation?

Question

Quizplus · Accepted Answer

The ala of the ilium (wings) are the most reliable landmark to evaluate the posteroanterior projection of the abdomen for rotation as they are the most stable points of the pelvis and do not move even when there is rotation of the body. The xiphoid process and ASIS can be affected by breathing or movement, while the symphysis pubis may be obscured by bowel gas.

Which Radiographic Landmark Is Most Reliable to Evaluate the Posteroanterior