Table 3.
Qualitative variables in percentage of cases; and Mean ± SD of quantitative variables evaluated by different ultrasonography methods (B-mode, Doppler and ARFI-elastography) in axillary lymph nodes of bitches with mammary lesions.
| Parameter | Free | Reactive | Metastatic | P-value | |
|---|---|---|---|---|---|
| B-Mode ultrasonography | |||||
| Shape | Elongated | 45% (15) | 31% (17) | 22% (2) | 0,1161 |
| Rounded | 55% (18) | 69% (37) | 78% (7) | ||
| Echotexture | Homogeneous | 82% (27) | 91% (49) | 67% (6) | 0,0949 |
| Heterogeneous | 18% (6) | 9% (5) | 33% (3) | ||
| Mixed | 0 (0) | 0% (0) | 0% (0) | ||
| Echogenicity | Hypoechoic | 97% (32) | 98% (53) | 89% (8) | 0,1981 |
| Hyperechoic | 3% (1) | 2% (1) | 0% (0) | ||
| Mixed | 0% (0) | 0% (0) | 11% (1) | ||
| Short/Long axis ratio | 0,47 ± 0,13 | 0,49 ± 0,12 | 0,53 ± 0,16 | 0,4724 | |
| Doppler ultrasonography | |||||
| Vascularization | Present | 10% (3) | 28% (15) | 22% (2) | 0,3154 |
| Absent | 90% (30) | 72% (39) | 78% (7) | ||
| Localization | Peripheral | 91% (30) | 98% (53) | 78% (7) | 0,3858 |
| Central | 9% (3) | 2% (1) | 22% (2) | ||
| ARFI-Elastography | |||||
| Deformability | Hard | 6% (2)a | 15% (8)b | 67% (6)b | 0,0005* |
| Soft | 94% (31) | 85% (46) | 33% (3) | ||
| Pattern (%) | Homogeneous | 100% (33)a | 96% (52)a | 44% (4)b | 0,0001* |
| Heterogeneous | 0% (0) | 4% (2) | 56% (5) | ||
| SWV (m/s) | 1,87 ± 0,27a | 2,30 ± 0,35b | 3,02 ± 0,50c | 0,0001* | |
| Depth (cm) | 1,19 ± 0,36 | 1,34 ± 0,39 | 1,37 ± 0,52 | 0,1989 | |
cm: centimetres; s: seconds; m: meters; SD: standard deviation; *Considered statistically significant, where different letters indicate significance between the histopathological diagnoses (p < 0.05).