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imaging characteristic and evaluation of MRI on the diagnosing of extra hepatic biliary stone
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Abstract
SUMMARY
Objective: Study of MR imaging characteristic of the extrahepatic CBD & its value about the stone finding.
Objet and Method: Retrospectiv of 56 patients having open
operation, endo and retrograde endoscopy from 10/2010 - 8/2011 at Bach mai hospital.
Means: USG of Philips HD11, MRI units of Siemens Advanto
and Essenza 1.5T.
Results: Among 56 operated patients for CBD stone, 6 free of stone (4 Oddi stenosis, 1 vater ampulla tumor, 1 unknown cause). MRI detected 49/50, missing 2% . In 49 positiv, 1 having 10 stones (2%), almost 3 (38%), the greatest 20 x 30mm, mainly localized at the III extrahepatic CBD portion (85/153 stones). 1 missing 5mm is at the IV portion, 49% inhomogenous mosaic form,79 strongly hyposignal on T2W. 22 patients (44.9%) associated with lithiasis in right bile duct, left 27 (55.1%), GB 13 (26.5%). Bile duct dilatation up and downward of the stone 23 (46.9%), hepatic abcess 3 (6.1%) Compare USG/MRI. USG: Se 96%, Sp 16.1%, PPV 48%, PPV 48%, Acc 52%. MRI: Se 98%,Sp 83,3%, PPV 98%, NPV 83.3%, Acc 96.4%.
Conclusion: MRI is a good means for detecting low CBD stone also for predicting its number, dimension, location and complication also Se, Acc evidently higher than USG.
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