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| Minimal fluid withdrawn |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*The category labeled “difficult to pass needle” is a subgroup of the cases that fall under the group “minimal fluid withdrawn.”