[Gallbladder carcinosarcoma associated with pancreaticobiliary maljunction with biliary dilation:a case report]

Area of Science:

• Gastroenterology
• Surgical Oncology
• Pathology

Background:

• Acute cholangitis can be a complication of biliary tract abnormalities.
• Pancreaticobiliary maljunction is a congenital anomaly associated with an increased risk of biliary tract cancers.
• Gallbladder cancer presents a diagnostic challenge, especially when mixed with other pathologies.

Purpose of the Study:

• To report a rare case of gallbladder carcinosarcoma.
• To highlight the diagnostic and surgical challenges in managing complex biliary tract tumors.
• To emphasize the importance of thorough pathological examination in diagnosing rare malignancies.

Main Methods:

• Computed tomography (CT) and cholangiography for initial diagnosis.
• Surgical resection including liver segments S4b+5 and bile duct resection with reconstruction.
• Histopathological examination of the resected gallbladder tumor.

Main Results:

• CT revealed common bile duct dilatation, gallbladder fundal tumor, and wall thickening.
• Cholangiography demonstrated pancreaticobiliary maljunction with biliary dilation.
• Pathology confirmed a mixed tumor: sarcoma in the fundal tumor and adenocarcinoma in the thickened wall, diagnosing gallbladder carcinosarcoma.

Conclusions:

• Gallbladder carcinosarcoma is a rare and aggressive malignancy requiring comprehensive diagnostic workup.
• Pancreaticobiliary maljunction can coexist with and potentially contribute to the development of complex gallbladder tumors.
• Multidisciplinary surgical and pathological evaluation is crucial for accurate diagnosis and treatment of such rare conditions.