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Biliary obstruction in metastatic disease: thin-section helical CT findings
1Department of Radiology, Seoul National University College of Medicine, Chongno-gu, Seoul 110-744, Korea.
Abdominal Imaging
|December 17, 2002
Summary
Metastatic biliary obstruction can mimic primary pancreatobiliary tumors on thin-section helical computed tomography (CT). This study details CT findings in 50 patients, highlighting atypical patterns that aid in diagnosis.
Area of Science:
- Radiology
- Medical Imaging
- Oncology
Background:
- Biliary obstruction is a common complication of metastatic disease.
- Accurate diagnosis is crucial for patient management and treatment planning.
Purpose of the Study:
- To describe the thin-section helical computed tomographic (CT) findings of biliary obstruction caused by metastasis.
- To identify atypical CT patterns that may mimic primary pancreatobiliary malignancies.
Main Methods:
- Retrospective review of thin-section helical CT (5 mm slice thickness) and direct cholangiography in 50 patients with biliary obstruction due to metastases.
- Analysis of primary tumor sites (stomach, colon, jejunum, uterus) and classification of CT findings into six types.
Main Results:
- Biliary obstruction occurred at the hilum (36%), proximal common duct (40%), distal common duct (10%), and periampullary area (14%).
- Periductal masses were the most common finding (68%), with some cases mimicking primary tumors.
- Extrinsic compression by metastatic liver masses and intraductal masses were also observed.
Conclusions:
- Thin-section helical CT can reveal atypical patterns of metastatic biliary obstruction.
- These patterns may mimic primary pancreatobiliary malignancies, necessitating careful interpretation.