Table 3 Relation between mean ADC values and prognostic factors in 50 patients with 50 RCC

Tumor size

≤ 4 cm

> 4 cm

1.3 ± 0.2

1.6 ± 0.2

0.001*

0.48

0.00*

Sex

Male

Female

1.4 ± 0.2

1.6 ± 0.2

0.05

0.28

0.05*

Tissue component

Solid

Mixed (cystic/necrotic)

1.4 ± 0.2

1.6 ± 0.1

0.005*

− 0.4

0.004*

Unenhanced T1

Hypointense

Isointense

1.6 ± 0.2

1.4 ± 0.2

0.001*

− 0.46

0.001*

Histopathology

Clear RCC

Non-clear RCC

1.5 ± 0.2

1.6 ± 0.2

0.1

0.22

0.13

Growth pattern

Infiltrative

Cortical

1.4 ± 0.2

1.6 ± 0.2

0.02*

− 0.3

0.01*

Clinical stage

Low-stage (1 and II)

High-stage (III and IV)

1.6 ± 0.2

1.4 ± 0.2

0.01*

− 0.4

0.01*

Lymph node metastasis

Yes

No

1.4 ± 0.2

1.6 ± 0.2

0.01*

− 0.4

0.01*

Tumor grade

I

II

III

IV

1.6 ± 0.2

1.6 ± 0.1

1.5 ± 0.3

1.3 ± 0.1

0.03*

− 0.4

0.004*