Camille -
Sounds like they are going to try a resection of the tongue and verify clear borders. I would recommend going to the best available ENT with a proven history of treating oral cancers for a second opinion.
Read my Signature. The partial glossectomy I had at the beginning of my journey had clear borders. However, the cancer cells had already metastasized to my lymph nodes, but did not show during the surgical prep x-rays and scans.
Don't mess around with this. Get a second opinion
Good Luck