Radiation therapy uses high-energy radiation to shrink tumors and kill cancer cells (1). X-rays, gamma rays, and charged particles are types of radiation used for cancer treatment.
1 Lymph nodes of the armpit and neck may also be involved. 2  Viral infections such as infectious mononucleosis may affect the whole body and cause generalized lymph node swelling in various parts of the body, such as neck, armpit or groin.
The lymph nodes of the groin, or inguinal lymph nodes, are located in the crease between the leg and pelvis. There are two types of inguinal lymph nodes â superficial and deep. They often swell due to an infection or cancer in the areas from which they drain lymph (lymphatic fluid).For this reason, swelling of the groin lymph nodes is an important clinical indication of pathology within the lower abdominal wall, legs, groin, buttocks, anus, perineum and external genitalia.hey often swell due to an infection or cancer in the areas from which they drain lymph (lymphatic fluid). For this reason, swelling of the groin lymph nodes is an important clinical indication of pathology within the lower abdominal wall, legs, groin, buttocks, anus, perineum and external genitalia.