Liz Buchanan BVSc MRCVS
Keymaster
Hello - Let's talk about lymphatics. All organs and tissues in the body are bathed in fluid; new fluid (water) is added all the time, to keep things fresh and hydrated. The fluid picks up dead cells, bacteria etc (a bit like dirty water in a swimming pool) and this drains away along soft little vessels called 'lymphatic vessels' (other vessels include blood vessels ie veins and arteries). At intervals along these lymphatic vessels / passages, are 'nodes' - think of them as filters that any catch infection, cancer cells and so on, from the local area. These filters are full of immune cells. If a virus or bacterium or an allergen, foreign material or indeed, a damaged cell such as a cancer cell, show up in that place, white blood cells will flock to that area in order to deal with it if possible. An active lymph node swells and this can often be felt or photographed from the outside. Therefore, a large lymph node in itself isn't definitely cancer; there may be other things going on. Your vet should check the node and make a decision, based on the individual case, what the sweeling is and how worried they are. They may decide to do tests before passing judgement; it would probably depend a lot on the context. Please note that as well as lymph nodes and cancers, other causes of lumps such as abscesses and luxations may be differentials. Always make sure that your vet is fully aware of an supplements that are being given. Wishing you lots of luck on this journey.
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