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Magnetic resonance cholangiography in hepatolithiasis.

OBJECTIVES
Our objective was to examine the usefulness of magnetic resonance cholangiography in hepatolithiasis.


METHODS
Ten patients with hepatolithiasis were studied by ultrasonography, computed tomography, direct cholangiography, and magnetic resonance cholangiography to detect stones and to determine the morphological features of the bile ducts. In nine patients who underwent surgery, dilation and stenosis of the bile ducts were confirmed by intraoperative cholangioscopy, pathology, or both.


RESULTS
Stones were demonstrated in seven patients by ultrasonography, in eight by computed tomography, in seven by direct cholangiography, and in all by magnetic resonance cholangiography. The locations of stones were identified in four patients by ultrasonography, in seven by computed tomography, in six by direct cholangiography, and in nine by magnetic resonance cholangiography. Among nine patients with dilation of the bile ducts, the dilation was shown by ultrasonography in seven, by computed tomography in eight, by direct cholangiography in six, and by magnetic resonance cholangiography in eight. Among seven patients with stenosis of the bile ducts, this stenosis was shown by direct cholangiography in four and by magnetic resonance cholangiography in six. Ultrasonography and computed tomography did not show the stenosis. Sensitivity for detection of biliary stenosis was significantly higher in magnetic resonance cholangiography.


CONCLUSIONS
This study shows that magnetic resonance cholangiography not only detects stones, but can also delineate detailed information on the bile ducts, which is useful in the planning of treatment for hepatolithiasis.