Which of the following anatomical variants involves the fundus of the gallbladder?

The anatomical variant that involves the fundus of the gallbladder is known as Phrygian's cap. This variant is characterized by a folding or bending of the fundus, causing it to appear like a cap. This fold can create a distinctive shape, which may resemble a cap on the gallbladder, and it is typically considered a benign finding during imaging.

Phrygian's cap does not typically impede gallbladder function or lead to any clinical symptoms; instead, it is often an incidental finding during imaging exams. Recognizing this variant is crucial for sonographers and radiologists to avoid confusion during assessment, as it may resemble pathological states.

Understanding this variant helps distinguish normal anatomical variations from potential pathologies, ensuring accurate diagnosis and avoiding unnecessary interventions.