Learn to identify key anatomical structures and understand their significance in appendix localization.
Video Source: This educational video is embedded from YouTube for non-commercial training purposes. All rights belong to the original creator.View original video
Successful appendicitis ultrasound requires thorough knowledge of right lower quadrant anatomy. The appendix typically arises from the posteromedial aspect of the cecum, but its position can vary significantly.
The blind pouch of the colon in the right lower quadrant. Identify by its characteristic haustra and location.
Significance: The appendix arises from the cecum - finding the cecum is the first step.
The junction between the small intestine and cecum. Appears as a focal thickening at the medial cecal wall.
Significance: A reliable landmark for locating the appendix base.
The posterior muscle of the abdominal wall. Provides a hypoechoic reference structure.
Significance: Helps orient the scan and identify retrocecal appendix position.
The external iliac artery and vein course through the pelvis.
Significance: Important vascular landmarks to avoid misidentification.
Appendix positioned posterior to the cecum (65% of cases)
Impact: May be more difficult to visualize; requires scanning posterior to cecum
Appendix extends into the pelvis (30% of cases)
Impact: May require transvaginal or transrectal scanning in some cases
Appendix positioned inferior to the cecum (2-3% of cases)
Impact: Scan more inferiorly than typical