Table 2.
Summary of results obtained for Tru‐cut biopsy (TCB) and fine‐needle aspiration biopsy (FNAB) specimens from liver in which FIP lesions were detected in routine histologic examination.*
| TCB | FNAB‐S | FNAB‐C | TCB or FNAB | |
|---|---|---|---|---|
| Histology/cytology | (n = 25) | (n = 22) | (n = 16) | (n = 22) |
| Nondiagnostic | 0 | 5 | 10 | 0 |
| False negative (FN, not consistent with FIP or dubious) | 9 | 3 | 0 | 3 |
| True positive (TP, consistent with FIP) | 16 | 14 | 6 | 19 |
| Diagnostic sensitivity [TP/(FN+TP)] | 0.64 | 0.82 | 1.0 | 0.86 |
| Immunochemistry | (n = 25) | (n = 16) | (n = 6) | (n = 21) |
| IHC or ICC negative (FN) | 19 | 11 | 5 | 13 |
| IHC or ICC positive (TP) | 6 | 5 | 1 | 8 |
| Diagnostic sensitivity [TP/(FN+TP)] | 0.24 | 0.31 | 0.17 | 0.38 |
*FNAB‐S indicates FNAB smears; FNAB‐C, FNAB cytocentrifuged specimens; IHC, immunohistochemistry; ICC, immunocytochemistry.