Comparison of Ultrasonography and Computed Tomography
to Evaluate the Causes of Biliary Obstruction
Naffisa Adedin, Abdullah Shahriar, Jafreen Sultana, Akhtar Uddin Ahmed, AS Mohiuddin, Nayeema Rahman
Citation Information :
Adedin N, Shahriar A, Sultana J, Uddin Ahmed A, Mohiuddin A, Rahman N. Comparison of Ultrasonography and Computed Tomography to Evaluate the Causes of Biliary Obstruction. Euroasian J Hepatogastroenterol 2012; 2 (2):98-103.
Objective: To observe the role of computed tomographic (CT)
scan and ultrasonography (USG) examination to evaluate the
causes of biliary obstruction.
Materials and methods: This cross-sectional study was
conducted in a total of 57 patients clinically suspected of
Results: The highest incidence of biliary obstruction was found
in the age group between 40 and 49 years and the mean (±SE)
age of the patients was 48.4 ± 1.6 years. Serum bilirubin and
serum alkaline phosphatase were high in all patients. For
evaluation of pancreatic mass, USG found true positive in 13
with no false positive, false negative 2 and true negative 42
cases. Similarly, CT scan found true positive in 15 and no false
positive, no false negative and true negative in 42 cases.
Sensitivity and specificity of USG in detecting pancreatic mass
were 80 and 97.6%. CT scan showed 93.3% sensitivity and
97.6% specificity. In case of gallbladder (GB) mass USG found
true positive in 20 and 1 false positive. There was no false
negative and true negative in 36 cases. CT scan also revealed
better sensitivity. USG could not detect any case of periampulla.
Conclusion: Accuracy of USG and CT is high in detecting biliary
tree dilatation, with CT scan slightly more accurate than USG.
The difference in cost between the two is likely to decline with
time and make CT even more attractive and handy for imaging
the hepatobiliary system.