Synchronous existence of medullary and papillary thyroid carcinoma is an extremely rare occurrence; however, it has been previously reported. Nonetheless, such coexistence combined with the absence of primary tumor lesions… Click to show full abstract
Synchronous existence of medullary and papillary thyroid carcinoma is an extremely rare occurrence; however, it has been previously reported. Nonetheless, such coexistence combined with the absence of primary tumor lesions of either of the two carcinomas has never been reported. In our case, a 34-year old male is found to have medullary thyroid carcinoma of unknown primary origin as well as papillary thyroid carcinoma.
               
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