Biliary Stricture After Necrotizing Pancreatitis: An Underappreciated Challenge.

Abstract

Biliary stricture in necrotizing pancreatitis (NP) has not been systematically categorized; therefore, we sought to define the incidence and natural history of biliary stricture caused by NP. Benign biliary stricture occurs secondary to bile duct injury, anastomotic narrowing, or chronic inflammation and fibrosis. The profound locoregional inflammatory response of NP creates challenging biliary strictures. NP patients treated between 2005 and 2019 were reviewed. Biliary stricture was identified on cholangiography as narrowing of the extrahepatic biliary tree to <75% of the diameter of the unaffected duct. Biliary stricture risk factors and outcomes were evaluated. Among 743 NP patients, 64 died, 13 were lost to follow-up; therefore, a total of 666 patients were included in the final cohort. Biliary stricture developed in 108 (16%) patients. Mean follow up was 3.5 ± 3.3 years. Median time from NP onset to biliary stricture diagnosis was 4.2 months (interquartile range, 1.8 to 10.9). Presentation was commonly clinical or biochemical jaundice, n = 30 (28%) each. Risk factors for stricture development were splanchnic vein thrombosis and pancreatic head parenchymal necrosis. Median time to stricture resolution was 6.0 months after onset (2.8 to 9.8). A mean of 3.3 ± 2.3 procedures were performed. Surgical intervention was required in 22 (20%) patients. Endoscopic treatment failed in 17% (17/99) of patients and was not associated with stricture length. Operative treatment of biliary stricture was more likely in patients with infected necrosis or NP disease duration ≥6 months. Biliary stricture occurs frequently after NP and is associated with splanchnic vein thrombosis and pancreatic head necrosis. Surgical correction was performed in 20%.