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Table 2 Characteristics on US of DSFP

From: Role of ultrasound in the diagnosis of primary and recurrent dermatofibrosarcoma protuberans

Characteristic Primary DSFP (n = 23) Recurrent DSFP (n = 35) P-value
Tumor size (mm) 21.84 ± 12.20 (6.5–50.33)a 25.10 ± 20.31 (5.0–80.33)a 0.093
Number of lesion    1.000
 Single 20 (90.9%) 31 (88.6%)  
 Multiple 2 (9.1%) 4 (11.4%)  
Lesion location    0.000*
 D-H 19 (86.4%) 13 (37.1%)  
 Hypodermis 3 (13.6%) 22 (62.9%)  
US morphology    0.038*
 Regularly oval 3 (13.6%) 10 (28.4%)  
 Tentacle-like projections or “claw” sign 11 (50.0%) 5 (14.3%)  
 Lobulated 4 (18.2%) 8 (22.9%)  
 Other Irregular Shape 4 (18.2%) 12 (34.3%)  
US echogenicity    0.455
 Hypoechoic mass 12 (54.6%) 25 (71.4%)  
 Mixed hypo 7 (31.8%) 7 (20.0%)  
 Hyperchoic 3 (13.6%) 3 (8.6%)  
Blood flow on CDFI    0.28
 Rich (Alder0-1) 5 (22.7%) 19 (54.3%)  
 Not rich (Alder2-3) 17 (77.3%) 16 (45.7%)  
Metastases 0 1 NS
US diagnosis    NS
 Benign lesion 8 (34.8%) 0 (0.0%)  
 Malignant/recurrence lesions 4 (17.4) 31 (88.6)  
 Indeterminacy 11 (47.8%) 4 (11.4%)  
  1. D-H dermis and hypodermis, US ultrasound, CDFI color Doppler flow, hyper hyperechoic, hypo hypoechoic, Mixed hypo a mass with mixed hypoechoic and hyperechoic regions, NS no significance
  2. *, P<0.05
  3. a Mean ± SD (range)