Long-term outcomes after biliary diversion operation for pancreaticobiliary maljunction in adult patients.

Aim: Pancreaticobiliary maljunction (PBM) with or without congenital biliary dilatation (CBD) is a risk factor for biliary tract cancer. We investigated long-term outcomes after biliary diversion operation with special reference to types of CBD. Methods: Subjects comprised 40 adult patients who underwent biliary diversion operation for PBM without biliary tract cancer. Group A comprised 20 patients with type la or Ic CBD, or non-dilated bile ducts, while group B comprised 20 patients with type IV-A CBD. The clinical findings and postoperative outcomes were compared between groups. Results: Of 40 patients, nine patients suffered from repeated cholangitis and eight of these nine patients suffered from hepatolithiasis after biliary diversion operation. Biliary tract cancer or pancreatic cancer was detected in four patients at 3 years and 2 months to 24 years after the operation. In three of these four patients, the serum concentration of carbohydrate antigen 19-9 increased before detection of carcinoma. One patient died of hepatic failure due to repeated cholangitis. The proportions of patients with repeated cholangitis, hepatolithiasis, and re-operation, and patients who died of biliary tract cancer, pancreatic cancer, or hepatic failure, were significantly higher in group B than in group A. The survival rate was significantly worse in group B than in group A. Conclusions: Careful long-term follow-up with measurement of serum tumor markers is necessary after biliary diversion operation for PBM, especially in patients with type IV-A CBD or repeated cholangitis.