States of Matter: Facts. Matter is all around us. Matter is the air you are breathing. Matter is the computer you are reading from now. Matter is the stuff you touch and see. And it is more. Matter is defined as anything that has mass and takes up space.
The high specificity at 10 and 11 mmindicates that lymph nodes of this size are almostalways metastatic in this level.A study of level II lymph nodes shows that for thewhole population a minimum diameter of 8 mm givesa relatively high sensitivity and specificity of 81% and80%, respectively.
There are more than 500 of them throughout the body, but theyâre most noticeable in the head and neck and under the arms, where theyâre closer to the surface of the skin. A healthy lymph node is about one centimeter wide, but exposure to germs or infection can cause it to swell to as much as an inch in diameter.