Thyroid cancer: what are the odds they have the diagnosis wrong?

Who diagnosed? If a pathologist made the diagnosis, the odds of wrong diagnosis are very very low. Denial by the patient is far more likely than wrong diagnosis by a pathologist.
How was Dx made? The statistical measure of an inaccurate test result is a false positive test. The incidence of false (+) following a fine-needle thyroid biopsy can be quite high depending on the findings. However, if this DX was established following thyroid surgery, the rate of false (+) is less-than 1%. If you need reinforcement, your doctor can request a second opinion from a different pathologist.
Depends on the bx. If the diagnosis was made after thyroidectomy - the chances are not high that they got it wrong, unless the pathologist is not used to looking at thyroid specimens. I have had them mistake hashimotos' thyroiditis for follicular carcinoma. This is easily cleared up by sending the slides to an academic or outside consultation. Papillary carcinoma is usually pretty clear on microscopic exam.

Related Questions

Thyroid cancer survivor. Family history of gallbladder disease, are the odds are that I'm more likely to get mine removed also? They had symptoms in late 30's

Maybe. There is definitely a genetic component to gallbladder disease, but it is still not possible to know who will actually need their gallbladder removed or not. In general, even those with gallstones only have removal of the gallbladder if they have symptoms that are likely caused from the gallbladder. Typically right upper abdominal pain radiating to the back, worse 30-60' after a fatty meal. Hope this helps! Read more...
Maybe. The two most common risk factors for gallbladder disease are genetics and diet. We can't do much about our genetics. If gallbladder disease runs in your family it is possible you may have the same problem at some time in your life the other risk factor – diet, we can do something about. I would recommend eating healthy and avoiding foods that are high in fat and cholesterol. Read more...

What are the odds of having stage 2B invasive ductal carcinoma her2 positive breast cancer and papillary thyroid cancer at age 40?

Odds are low. But it is still possible to have both. Risk of having papillary thyroid before forty is about 13/100,000. Risk of having breast Ca is about 11/100,000. The overlap of the two independent events is slightly less than 1 in a million. Read more...