What is the name for the fold located in the fundal portion of the gallbladder?

The fold located in the fundal portion of the gallbladder is known as the Phrygian cap. This anatomical variant occurs when there is a fold in the fundus of the gallbladder, which can give it a cap-like appearance. It's important to recognize this variant during ultrasound examinations, as it may resemble pathology but is, in fact, a normal anatomical structure.

Understanding this variant is essential for sonographers and radiologists to avoid misinterpretation of gallbladder morphology and to ensure accurate diagnoses. The Phrygian cap is often detected incidentally during imaging studies and does not usually require any treatment or intervention. Proper identification of such variants contributes to a deeper understanding of biliary anatomy and aids in differentiating normal anatomical structures from possible pathological changes.