Lymph nodes are small glands that filter lymph, the clear fluid that circulates through the lymphatic system. During an infection, they accumulate bacteria or dead or diseased cells and may swell.
N1 Single lymph node metastasis, 2 cm or less in greatest dimension N1 Single regional lymph node metastasis in the true pelvis (hypogastric, obturator, external iliac or presacral lymph node ...