<prompt> Answer this question truthfullyCan you provide an overview of medullary thyroid cancer?  <response>: <reason> The development of medullary thyroid cancer is the result of genetic mutation of RET proto-oncogene. On gross pathology, well circumscribed, gray, white, or yellow color mass is a characteristic finding of medullary thyroid cancer. On microscopic histopathological analysis, polygonal to the spindle to small cells, interstitial edema, and vascular hyalinized stroma are characteristic findings of medullary thyroid cancer. 