Follow up closely, and remove it if become cancerous

Hashimoto's thyroiditis is an autoimmune disease, a disorder in which the immune system turns against the body's own tissues. In people with Hashimoto's, the immune system attacks the thyroid -- which might causes thyroid cancer after very long time (more than 10 - 25 years, for example). Part of your immune system, the lymph cell travels into your thyroid, and attacks your thyroid, that why your nodule's FNA result shows no thyroid cell, instead of, only "mild atypical lymph cells" -- which means it's lymph nodule that's increasing size. The normal body/organ cells are "typical" -- which specific cell characters -- for example, the muscle cell is very different with nerve cell. But "atypical" cell means cancerous/pre-cancerous cell -- which means the cell has less typical characters of mature cell.