I'm sorry for the latest troubles for your brother. It's possible to FNAB, with ultra sound guidance, a lesion that small. I had smaller, even 3mm x 7mm. I'm not sure of the word your looking for, possibly reminiscent cancer? Although I don't have the same type cancer, mine is oropharyngeal, but I had 7 recurrences in my neck to the same area the past 5 years, and doctors were able to treat. Good luck.