Objective To summarize the experience of diagnosis and treatment of malignant change in 7 patients with primary congenital cyst of common bile duct in the past 20 years.Method The clinical data of 7 patients admitted from 1980 to 2000 was analyzed retrospectively.Results and conclusions The site of 6 cases with carcinoma was on the cyst wall,which 1 case spreaded to the pancreas.The pathologic feature of this disease was malignancy,most of which was adenocarcinoma.A new procedure which can prevent from malignance of congenital cyst of common bile duct is recommended.Intraoperative frozen section examination is helpful to comfirm diagnosis.Cystectomy with pancreatoduodenectomy would be done in the cases spreading to the pancreatc head.
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