Table 2 Summary of gray-scale and color Doppler ultrasound characteristics of recurrent deep dermatofibrosarcoma protuberans (DFSP) and post-resection scar

Lesion No.

34

38

Depth, mm

14.5 ± 10.9

6.0 ± 4.9

0.004

Shape

 Regular

12

25

0.010

 Irregular

22

13

Border

 Well-defined

14

34

0.000

 Ill-defined

20

4

Echogenicity

 Hyperechoic

2

0

0.425

 Hypoechoic

22

35

0.004

 Hypoechoic with finger-like projections

5

0

0.047

 Mixed echoic

5

3

0.294

Echotexture

 Homogeneous

7

35

0.000

 Heterogeneous

27

3

Vascular density (/cm²)

2.79 ± 1.09

0.53 ± 0.60

0.000

Blood flow on CDFI

 No (Alder 0)

0

17

0.000

 Not rich (Alder 1)

9

16

 Rich (Alder 2–3)

25

5

Arterial flow

34

5

0.000

Venous flow

34

18

0.000