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Functional causes of the ductal obstructive pattern on hepatobiliary scans
K B Ford1, B A Porter, R C Stadalnik
1Department of Radiology, Good Samaritan Hospital, San Jose, California.
Clinical Nuclear Medicine
|September 1, 1987
Summary
Hepatobiliary imaging can suggest bile duct obstruction, but functional liver issues can mimic this. Two cases highlight how liver dysfunction, not bile duct blockage, caused imaging patterns resembling obstruction.
Area of Science:
- Hepatobiliary imaging
- Nuclear medicine
- Diagnostic radiology
Background:
- Technetium-99m iminodiacetic acid (Tc-99m IDA) derivatives are valuable for evaluating hepatobiliary diseases.
- A common finding in Tc-99m IDA scintigraphy is prompt hepatocellular uptake with nonvisualization of the common bile duct and bowel, often suggesting high-grade obstruction.
Observation:
- This imaging pattern is not pathognomonic for common bile duct obstruction.
- Hepatocellular excretory dysfunction, leading to intrahepatic cholestasis, can also produce similar findings.
- Two cases illustrate this: one with E. coli endotoxemia and another with acute hepatitis A.
Findings:
- Hepatocellular excretory dysfunction can mimic ductal obstructive patterns on Tc-99m disofenin scintigraphy.
- In patients with patent biliary ducts, this pattern indicates functional liver impairment rather than mechanical obstruction.
- The reported cases involved E. coli endotoxemia and acute hepatitis A, both causing intrahepatic cholestasis.
Implications:
- Distinguishing functional hepatobiliary abnormalities from mechanical obstruction is crucial for accurate diagnosis and patient management.
- Further investigations like transhepatic cholangiography or endoscopic retrograde cholangiography may be necessary when obstruction is suspected but uncertain.
- This highlights the importance of considering hepatocyte function in interpreting Tc-99m IDA scans.