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Table 3 Number of patients with PET-positive lymph nodes in a solitary region; in all patients and in subgroups according to primary tumor localization

From: Patterns of pathologic lymph nodes in anal cancer: a PET-CT-based analysis with implications for radiotherapy treatment volumes

Solitary regiona of PET-positive lymph nodes

 

Inguinalb

Perirectalb

Internal iliac

External iliac

Common iliac

Para-aortic

All patients (n = 42)

25c of 42 (60%)

11 (26%)

4d (10%)

1e (2%)

1f (2%)

0 (0%)

Tumor localization

 Anal canal

4 of 5 (80%)

0 (0%)

0 (0%)

0 (0%)

1 (20%)

0 (0%)

 Anal canal + rectum

2 of 15 (13%)

9 (60%)

3 (20%)

1 (7%)

0 (0%)

0 (0%)

 Anal canal + perianal

16 of 17 (94%)

1 (6%)

0 (0%)

0 (0%)

0 (0%)

0 (0%)

 Anal canal + rectum + perianal

3 of 5 (60%)

1 (20%)

1 (20%)

0 (0%)

0 (0%)

0 (0%)

  1. a PET-positive lymph nodes limited to only one of the following regions: left inguinal, right inguinal, perirectal, left internal iliac, right internal iliac, left external iliac, right external iliac, left common iliac, right common iliac, para-aortic
  2. b P < 0.01 in crosstabs of lymph node positivity in relation to tumor localization
  3. c 21 saphenofemoral (SF); 2 SF + upper inguinal; 1 SF + lower inguinal; 1 upper inguinal
  4. d 3 lower internal iliac; 1 upper internal iliac
  5. e 1 lower external iliac, medial
  6. f 1 common iliac, lateral. This lymph node is likely a false positive, further explained in the results section