There are also clinical trials (research) for chemotherapy protocols for patients with lung metastases that do not take up I-131 and are enlarging.
Would still go for surgery for thyroid and any neck lymph nodes first.
Then I-131 (radioactive iodine) after surgery - if the lung spot takes up I-131, then we know it's thyroid cancer metastasis. 50% or more survival at 5 years in a 67 year old male with PTC to lung.
If the spot does not take up I-131, sometimes biopsy is required to determine what it is.
PET scanning may be helpful.
Occassionally, if solitary lung nodule/metastasis, it can be removed.
And what would be our treatment options at that point