I have Hashimoto's and my biopsy came back the same way. My doctor said this was due to inflammation from Hashimoto's. She said it would probably make sense to do another biopsy to get actual thyroid cells and determine if they are cancerous. I'm not sure if I am going to do this, but I am sort of pissed that they didn't get the cells they needed the first time.
Oh, and I am a man. I don't know if that makes any difference.
This is likely hashimotos -- lymphocytic thyroiditis -- 'live cell' is flow cytometry -- can help exclude lymphoma.