Table 2 MRI parameters according to groups with and without muscle invasion, for both readers (reader 1 top line; reader 2 bottom line)

Presence of stalk

4 (16.0%)

1 (4.0%)

p = 0.16

4 (16.0%)

1 (4.0%)

p = 0.16

Form

papillary - 23 (92.0%)

flat - 2 (8.0%)

papillary - 16 (64.0%)

flat - 9 (36.0%)

p = 0.01

papillary - 23 (92.0%)

flat - 2 (8.0%)

papillary - 17 (68.0%)

flat - 9 (32.0%)

p = 0.03

Size (cm)

2.42 +/−  1.58

(0.7–7.0)

5.70+/−  2.67

(2.2–14.0)

p < 0.0001

2.37 +/−  1.50

(0.7–6.8)

5.44 +/−  2.90

(1.6–14.8)

p < 0.0001