Ductal remnants in extrahepatic biliary atresia: A histopathologic study with clinical correlation.

Atretic ducts were studied in 34 infants undergoing the portoenterostomy procedure for biliary atresia. The specimens were grouped into three categories on the basis of the size of the lumen at the proximal margin: Type I with a lumen 150 mu or greater, Type II with single to multiple ductal structures measuring less than 150 mu, and Type III with no identifiable epithelium-lined structures in fibrous connective tissue. A significant correlation existed between postoperative bile drainage and the duct type; bile drainage occurred in all five patients with Type I ducts, 18 of 21 patients with Type II ducts, and one of eight patients with Type III ducts. Furthermore, the duct type was the only feature that correlated with the ultimate outcome. Ductal inflammation and hepatic histology did not correlate with postoperative bile drainage or clinical course.