Hello Lisa,
Regarding the nodes, especially the 1.9 cm one, you may want to ask the doctor, if it could be biopsied through Fine Needle Aspiration (FNA).
The FNA is done by penetrating the node with the needle of a syringe and than extracting some of the node cells with the syringe. Usually 3 to 4 biopsy samples are taken. The cells can than be evaluate for cancer by the doctor.
FNAs however are not 100 percent accurate because the biopsy samples could be taken from a part of the node where there are no cancer cells.
There are benefits to the neck dissections:
1) The nodes are removed and with them any cancer cells that they may contain.
2) A pathologist will evaluate the nodes for the presence of cancer cells which will be used for staging the disease.
3) Survival rates improve when neck dissections are done and this is purely statistical.