CT differentiation of the oncocytoma and renal cell carcinoma based on peripheral tumor parenchyma and central hypodense area characterisation

Table 2 The comparative analysis on qualitative features of ROs and RCCs

Variables	ROs (n = 23)	CcRCCs (n = 85)	P value	Non-ccRCCs (n = 24)	P value
The largest diameter of tumor (cm)	4.47 ± 2.11	4.74 ± 1.50	0.156	5.40 ± 1.94	0.079
The CHA’s long-axis diameter(cm)	2.43 ± 1.32	3.05 ± 1.29	0.046	3.12 ± 2.12	0.317
LSR	1.43 ± 0.36	1.58 ± 0.39	0.048	1.66 ± 0.50	0.062
LTR	0.54 ± 0.18	0.63 ± 0.14	0.013	0.54 ± 0.21	0.686
AVT
PCP	38.35 ± 4.74	38.86 ± 6.25	0.717	41.08 ± 8.36	0.148
CMP	139.17 ± 24.97	189.20 ± 44.46	< 0.001	119.04 ± 50.14	0.015
NP	125.74 ± 21.86	121.73 ± 22.21	0.443	95.29 ± 26.38	< 0.001
EP	62.87 ± 10.64	60.56 ± 9.69	0.324	58.46 ± 10.16	0.031
RER
PCP	1.09 ± 0.17	1.15 ± 0.22	0.372	1.22 ± 0.23	0.418
CMP	0.86 ± 0.12	1.18 ± 0.23	< 0.001	0.67 ± 0.27	0.004
NP	0.77 ± 0.13	0.75 ± 0.12	0.589	0.57 ± 0.15	< 0.001
EP	0.74 ± 0.11	0.73 ± 0.17	0.688	0.67 ± 0.14	0.008

AVT Attenuation value of tumor, ccRCC Clear cell renal cell carcinoma, CHA Central hypodense area, CMP Corticomedullary phase, EP Excretory phase, LSR Long-to-short-axis ratio. LTR Long-tumor-axis ratio, NP Nephrographic phase, PCP Pre-contrast phase, RO Renal oncocytoma, RCC Renal cell carcinoma, RER Relative enhancement ratio
All numeric variables are expressed as means ± standard deviation

ISSN: 1471-2342