<prompt> Metastasis in thyroid gland come most commonly from carcinoma ofTestisProstateBreastLungs  <response>: The above-mentioned book is solely dedicated to surgery and diseases of thyroid parathyroid gland.It writes -Metastatic disease to the thyroid may occur as a consequence of direct extension from upper aerodigestive malignancies, i.e., squamous cell Ca, or by hematogenous spread. Evidence at autopsy has demonstrated upto 20 of patients exhibiting distant metastasis to the thyroid gland from breast, lung, kidney, melanoma skin most commonly. 