Table 3: nondiagnostic EUS-FNA cases.

Reason Frequency Percent of total Number of FNA passes      3 passes 2 10.00  2 passes 5 25.00  1 pass 3 15.00  Not listed 10 50.00 Total 20 100.00 Other reasons      Unidentifiable cause 10 50.00  Minimal fluid withdrawn 8 40.00  Difficult to pass needle* 3 15.00  Suspected autoimmune or chronic inflammation 2 10.00  False negatives 8 40.00 Total 20 100.00 Sensitivity 83.3%   Specificity 100.00%   Positive predictive value 100.00%   Negative predictive value 91.6%   Accuracy 94.1%

Listed is a summary of suspected causes of nondiagnostic and false negative FNA cases, along with sensitivity, specificity, PPV, NPV, and overall accuracy of EUS-FNA. The category labeled “difficult to pass needle” is a subgroup of the cases that fall under the group “minimal fluid withdrawn.”