Table 3: nondiagnostic EUS-FNA cases.

ReasonFrequencyPercent 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 Minimal fluid withdrawn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The category labeled “difficult to pass needle” is a subgroup of the cases that fall under the group “minimal fluid withdrawn.”