Fig. 2

Regional, ano-inguinal lymphatic drainage (AILD), and common iliac/para-aortic (CI/PA) recurrences in 17 patients. Recurrence in GTVN (red; 7 patients, 7 lymph nodes); within elective CTV (orange; 7 patients, 10 lymph nodes); outside elective CTV but within pelvis or inguinal (yellow; 1 patient, 2 lymph nodes); AILD (green; 2 patients, 2 metastases); CI/PA (purple; 7 patients, 20 lymph nodes). Blue, inferior vena cava, external iliac, femoral, and great saphenous vein. Center of lymph node mapped with a 9 mm sphere in a standard anatomy reference CT