ATYPICAL FOLLICULAR HURTHLE METAPLASIA

Hello i am new to the board and i am also very worried. My mom lives out of state and was told that she needs to come back in to see the doctor after a biopsy that she had for her thyroid. The doctor has told her that she has ATYPICAL FOLLICULAR HURTHLE CELL METAPLASIA. But my concern is that she is 79 years old and she asked him last year to remove her thyroid and he told her no because of her age.  I guess my question for you guys here is what can she aspect? are these cell malignant? Are they dangerous? is it possible for it to spread? if anyone on here can give me any feed back it will be greartly appreciated. Has anyone been diagnosed with the same thing? if so what can she expect? Thank you for listening i am very concerned.