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Table 1 TRUS features of ARMM and LRAC

From: Can transrectal ultrasonography distinguish anorectal malignant melanoma from low rectal adenocarcinoma? A retrospective paired study for ten years

Features ARMM (n = 9) LRAC (n = 27) P
L (mean ± SD, mm) 28.22 ± 12.29 40.22 ± 15.16 0.037
T (mean ± SD, mm) 14.63 ± 6.73 15.75 ± 7.33 0.699
M-Dist (mean ± SD, mm) 50.78 ± 11.70 63.81 ± 18.73 0.028
I-Dist (mean ± SD, mm) 36.67 ± 8.82 43.44 ± 19.60 0.181
DOI n (%)    0.046
 Shallow 6(66.67) 7 (25.93)  
 Deep 3(33.33) 20 (74.07)  
PSV (cm/s) 31.40 ± 25.56 34.3 ± 22.91 0.547
RI 0.77 ± 0.14 0.83 ± 0.13 0.416
Location n (%)    0.255
 A 6(66.67) 11(40.74)  
 NA 3(33.33) 16 (59.26)  
Echotexture, n (%)    0.148
 Homogeneous 7(77.78) 26(96.30)  
 Heterogeneous 2 (22.22) 1(3.70)  
LN metastasis, n (%) 4(44.44) 16(59.26) 0.470
Maximum diameter of LN (mm) 10.25 ± 6.80 6.25 ± 1.75 0.384
  1. TRUS: Transrectal ultrasonography. ARMM: Anorectal malignant melanoma. LRAC: Low rectal adenocarcinoma. L: length. T: Thickness. M-Distance: the distance between the tumor midpoint and the anal verge. I-Distance: the distance between the inferior border of tumor and the anal verge. DOI: depth of invasion. Shallow: mucosa-submucosa invasion. Deep: muscularis propria-adventitia invasion. LN metastasis: the presence of lymph node metastasis. Maximum diameter of LN: the maximum diameter of metastatic lymph node. SD: Standard deviation. Bold indicates statistical significance