Incidental Gallbladder Duplication Detected on Imaging: A Case Report

A rare anatomical variation in which a patient’s gallbladder was found to have two separate structures—rather than the single, pear-shaped organ typically present—was documented in a June 2026 case report published in Cureus, a peer-reviewed medical journal. The duplication was discovered incidentally during imaging for unrelated gastrointestinal symptoms in an adult, highlighting how uncommon congenital anomalies can evade detection until routine scans reveal them.

The case, described by researchers as an example of gallbladder duplication, occurred in a patient presenting with vague abdominal discomfort, nausea, and intermittent pain—symptoms that did not immediately suggest a biliary issue. According to the report, standard ultrasound imaging initially showed an irregularity, which was later confirmed via computed tomography (CT) to be a complete duplication, with two distinct gallbladder-like structures connected by a shared cystic duct. The patient had no prior history of gallbladder disease, surgery, or trauma, ruling out acquired causes.

“This case underscores the importance of thorough imaging review, even when symptoms are nonspecific,” said Dr. Elena Vasquez, a radiologist at the University of California, San Diego, who was not involved in the study but has published on congenital gastrointestinal anomalies. “Duplications like this are exceedingly rare—estimated to occur in fewer than 0.01% of the population—yet they can complicate surgeries or lead to misdiagnosis if overlooked.”

The finding aligns with prior literature on gallbladder anomalies, which include variations such as agenesis (absence), situs inversus (mirror-image positioning), and partial duplications. A 2023 study in Journal of Clinical Imaging Science noted that most duplications are discovered incidentally, often during workups for gallstones, pancreatitis, or abdominal pain. Surgical intervention is typically reserved for cases where the duplication causes obstruction, infection, or symptoms, though asymptomatic patients may require only monitoring.

In this instance, the patient underwent laparoscopic cholecystectomy—removal of both gallbladder structures—to prevent future complications, such as stone formation or inflammation in either pouch. Postoperative recovery was uneventful, and follow-up imaging confirmed no residual anatomical abnormalities. The researchers emphasized that while gallbladder duplication is a curiosity for anatomists, its clinical relevance lies in avoiding diagnostic delays or unnecessary procedures.

For clinicians, the case serves as a reminder that nonspecific gastrointestinal symptoms can mask rare anatomical variations. The American College of Radiology’s guidelines recommend high-resolution imaging for persistent abdominal pain, particularly when ultrasound or CT reveals unexpected findings. Meanwhile, surgeons advising patients on gallbladder-related procedures should be aware of the possibility of duplications, which may alter surgical approaches.

What remains uncertain is whether gallbladder duplication carries a higher risk of complications than a single gallbladder. The Cureus report notes that long-term data on duplicated organs are limited, and most cases in the literature describe incidental findings without clear clinical impact. Future research may explore whether these anomalies predispose individuals to specific biliary diseases, though current evidence suggests they are largely benign unless symptomatic.

For patients experiencing unexplained abdominal symptoms, experts recommend consulting a gastroenterologist or hepatobiliary specialist for targeted imaging. While gallbladder duplication is rare, the case illustrates how modern diagnostic tools can uncover anomalies that might otherwise go unnoticed—reinforcing the value of thorough medical evaluation.

Key Figures and Context

• Prevalence: Fewer than 0.01% of the population (per Journal of Clinical Imaging Science, 2023).
• Discovery Method: Incidental finding during CT/ultrasound for nonspecific gastrointestinal symptoms.
• Surgical Outcome: Laparoscopic removal of both structures; no complications reported.
• Clinical Guidance: ACR recommends high-resolution imaging for persistent abdominal pain with unclear etiology.