Ultrasonographic Appearance of Gallbladder Diverticula: A Pictorial Essay

Gallbladder diverticula ultrasonography serves as a vital tool for identifying rare developmental anomalies of the gallbladder wall. These herniation-like outpouchings often remain undetected until surgery. However, modern imaging techniques now offer better preoperative visualization. Clinicians must recognize these structures because they can mimic cholecystitis. This identification is crucial for preventing complications during surgical procedures like cholecystectomy.

Understanding Gallbladder Diverticula

A gallbladder diverticulum is a rare condition characterized by a focal protrusion of the gallbladder wall. The reported incidence in autopsy studies varies widely, ranging from 0.0008% to 9%. Specifically, these anomalies can be congenital (true) or acquired (false). True diverticula contain all layers of the gallbladder wall, while false ones lack a complete muscular layer. Although many patients are asymptomatic, others present with atypical abdominal pain or jaundice.

Gallbladder Diverticula Ultrasonography Features

In clinical practice,

Gallbladder diverticula ultrasonography

helps clinicians visualize the communication between the outpouching and the main gallbladder lumen. Sonographers typically look for a cystic structure adjacent to the gallbladder wall. This structure usually maintains a clear connection to the gallbladder cavity. Furthermore, ultrasound can detect associated complications such as sludge or stones trapped within the diverticulum. Consequently, greater awareness of these sonographic features among radiologists improves diagnostic reporting quality.

Clinical Challenges and Management

Initially, these diverticula may be mistaken for other pathologies. For instance, an inflamed diverticulum can mimic acute cholecystitis on imaging. Moreover, their presence may pose significant challenges during a laparoscopic cholecystectomy. If the surgeon is unaware of the anomaly, they may encounter technical difficulties or accidental injury. Therefore, a reliable preoperative assessment via ultrasound is essential for optimal patient outcomes and surgical planning.

FAQs

Can gallbladder diverticula cause symptoms?

While often incidental, they can mimic cholecystitis symptoms or cause biliary colic if stones or sludge form within the diverticulum.

How does ultrasound help before surgery?

It identifies the diverticulum's exact location and its relationship to the gallbladder wall, helping surgeons avoid potential complications during gallbladder removal.

Is a gallbladder diverticulum different from a Phrygian cap?

Yes. A Phrygian cap is a folding of the gallbladder fundus, whereas a diverticulum is a distinct herniation-like outpouching from the wall.

Disclaimer: This content is for informational and educational purposes only... Refer to the latest local and national guidelines for clinical practice.

References

• Czepe G et al. Ultrasonographic appearance of gallbladder diverticula: a pictorial essay. Med Ultrason. 2026 Mar 18. doi: 10.11152/mu-4593. PMID: 41849786.


• Singh P, et al. Congenital gallbladder diverticulum: A rare case report and review of literature. J Clin Imaging Sci. 2021;11:29.


• Chen J, et al. Gallbladder Diverticulum as a Rare Disease and a Therapeutic Challenge: A Case Report. Cureus. 2024;16(6):e61932.