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Fig. 1B —Diagrams of method of calculating change in ileocecal-appendiceal angle. In these sagittal views, ventral abdominal wall is to left and spine is to right. Comparison supine view shows change in ileocecal angle of 60° relative to prone baseline view. Anteroposterior rotation leaves ileocecal valve in same location but causes appendix to be located more caudally and posteriorly when patient is in supine position.