What is the metastatic rate of thyroid tumors?
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“In addition to being locally invasive, thyroid tumors have a relatively high rate of metastasis, mainly to the lungs and regional lymph nodes. At the time of diagnosis, as many as 40 percent of the dogs have detectable metastasis. Ultimately, up to 80 percent of thyroid tumors metastasize.”
-Kim L. Cronin, DVM, DACVIM
From Definitive diagnosis of thyroid malignancy