A case of biliary cystadenocarcinoma with malignant seeding of the tract after percutaneous catheter drainage.

Biliary cystadenocarcinoma is rare tumor that originates from the hepatobiliary epithelium, and its clinical diagnosis is difficult during the preoperative course. A 65-year-old woman with biliary cystadenocarcinoma was misdiagnosed as hepatic abscess and underwent ultrasonography-guided percutaneous catheter drainage. Ten months later, the patient was re-admitted to our department with a mucin-producing cauliflower-like mass measuring 10x10x5 cm³ at the site of puncture. Tumor seeding through the percutaneous catheter drainage tract was diagnosed. Complete resection of the primary and metastatic tumor with partial abdominal wall tissue was performed. No local recurrence could be found after a follow-up of more than two years.