???????? If the tests were inconclusive, it's most likely that the mass in your thyroid is of the follicular cell type whose two different forms (a benign tumour and a malignant tumour) can't be differentiated through a fine needle aspiration. I would seek another opinion because that much of a discrepancy between what the surgeon says and what the endocrinologist says is pretty big. I would tend to go with the endocrinologist though....why? Because (s)he sees ALL the people with thyroid problems whether they are benign or malignant; however, as you can probably guess, the surgeon only sees the people sent to him/her by the endocrinologist, and most of these tend to be cancerous. Either get another opinion from someone who is a non-surgeon, or else talk to your endocrinologist again and mention what your surgeon said.
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Possible thyroid cancer 
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