Table 3 MR imaging characteristics between high-grade and low-grade endometrial stromal sarcomas

n

11

9

Tumor size (cm)

11.25 ± 2.90

7.76 ± 3.55

0.056

0.828

ADC value (×10⁻³ mm²/sec)

0.99 ± 0.13

1.09 ± 0.120

0.190

N/A

Tumor location

0.206

0.971

 Fundus

0 (0.0)

3 (33.3)

 Body

5 (45.5)

3 (33.3)

 Cervix

1 (9.1)

0 (0.0)

 Diffuse

5 (45.5)

3 (33.3)

Tumor involvement

0.336

1.000

 Endometrium and myometrium

8 (72.7)

5 (55.6)

 Endometrium only

0 (0.0)

0 (0.0)

 Myometrium only

2 (18.2)

4 (44.4)

 Cervix

1 (9.1)

0 (0.0)

Serosa penetration

5 (45.5)

1 (11.1)

0.157

0.870

Margin

0.714

0.875

 Well-defined

7 (63.6)

5 (55.6)

 Ill-defined

4 (36.4)

4 (44.4)

Worm-like nodules

4 (36.4)

4 (44.4)

1.000

0.898

Marginal nodules

9 (81.8)

5 (55.6)

0.336

0.875

Intratumoral nodules

10 (90.9)

6 (66.7)

0.285

0.828

T2 hypointense bands

11 (100.0)

9 (100.0)

N/A

1.000

Feather-like enhancement

10 (90.9)

0 (0.0)

< 0.001 *

1.000

Necrosis

10 (90.9)

3 (33.3)

0.017 *

0.780

Hemorrhage

10 (90.9)

4 (44.4)

0.050 *

0.886

Tumor enhancement

0.082

0.920

 Less than myometrium

10 (90.9)

4 (44.5)

 Equal to myometrium

1 (9.1)

3 (33.3)

 Greater than myometrium

0 (0.0)

2 (22.2)