FryGuy,

That is quite a question.

I watch a lot of diagnostic shows on cable. If I remember correctly, There was a recent 'Mystery Diagnosis' where a pituitary tumor was suspected in connection to an injury. The problem is which came first. Did the injury just cause the tumor symptoms to become exaggerated to the point of being obvious?

It is a difficult issue to decide either way.

Does the origin of the tumor make any difference in how the tumor is treated?

Most neurological treatment is not based on causation. The diagnosis and symptoms are treated. Even medications are usually directed at symptoms and rarely causation.

If one has low thyroid, they treat it by adding thyroid. They don't get stuck trying to determine why the thyroid is low.

I could conceive of a situation where a pituitary tumor is exacerbated by an out of balance neurological call for more hormones. Would excessive production from the pituitary cause it to grow too big?

I think that even the best experts will have differing opinions.

Do you have a question I have an answer for? This one is beyond me. Even the Mayo Clinic is vague on causation.