These include the armpits, neck, groin, upper abdomen, and mediastinum (the area between the lungs that contains all the principal organs of the chest). Swollen lymph nodes in the armpits ...

The scalene fat pad is incised, and if lymph nodes are discovered they are ... had been noted 10 years previously, and serial x-ray films of the chest had shown a progressive increase in the ...

Yawnick eventually got a chest X-ray under the discretion of a chiropractor ... "They then build up in lymph nodes behind the breastbone and between the lungs" in an area called the mediastinum.