Thyroid nodules can be benign or malignant, and only a biopsy can determine that, I know nothing about the 33mm - but seems large.Even if it is malignant, I know of many who have had this and the cancer is a long time contained in the Thyroid and does not spread quickly.The usual treatment is to have the whole of the Thyroid out, and to take the hormone Thyroxine in tablet form every day.