Table 2.
Patient and tumour characteristics of the 95 small renal masses subcategorised according to tumour diameter
| Diameter | ≤2 cm (n = 25) | > 2 to ≤ 3 cm (n = 44) | > 3 to ≤ 4 cm (n = 26) | p value |
| Diagnostic first biopsy/non-diagnostic first biopsy | 21/4 | 38/6 | 22/4 | 1.00b |
| Male/female | 14/11 | 25/19 | 16/10 | 0.91c |
| Mean age (95% CI) | 62.9 (57.2–68.6) | 66.5 (62.8–70.2) | 61.5 (55.0–68.0) | 0.40d |
| Right/left | 14/11 | 20/24 | 10/16 | 0.54c |
| Needle gauge (18G/20G)a | 17/5 | 35/8 | 20/5 | 0.94c |
| Image guidance (CT/ultrasound) | 19/6 | 30/14 | 13/13 | 0.13c |
| Tumour location | ||||
| Upper pole | 5 | 12 | 10 | 0.16c |
| Interpolar | 11 | 19 | 14 | |
| Lower pole | 9 | 13 | 2 | |
| Exophytic/endophytic | ||||
| ≥50% exophytic | 13 | 16 | 10 | 0.37c |
| <50% exophytic | 8 | 16 | 6 | |
| Endophytic | 4 | 12 | 10 | |
| Centrality | ||||
| ≥7 mm from collecting system/sinus | 17 | 11 | 8 | <0.01b |
| >4 but ≤7 mm from collecting system/sinus | 5 | 12 | 1 | |
| ≤4 mm from collecting system/sinus | 3 | 21 | 17 | |
| Anterior/posterior | ||||
| Anterior | 10 | 9 | 9 | 0.42b |
| Posterior | 13 | 28 | 13 | |
| Neither | 2 | 7 | 4 | |
CI, confidence interval.
a
Data on needle size were not available for all cases.
b
Fisher’s exact test.
c
X2 test.
d
Kruskal–Wallis test.