I'm going out on a limb here, because I don't have a pituitary problem. I'm answering because pituitary tumors are pretty rare, and perhaps you wouldn't get an answer otherwise.
such a thing as pituitary hypothyroidism, also called secondary hypothyroidism. It's symptoms and treatment are pretty much the same, although I think
(don't hold me to it, though) that the tumor can be removed and the hypoT will reverse.
We all have been told at one time or another that our thyroid tests are "fine".... But we all have learned otherwise, once a doctor adept at thyroid problems got a look at them. There's a lot of subjectivity to thyroid test interpretation.
Your husband's TSH probably looks "fine" because the tumor is preventing the pituitary from producing it. This type of hypoT always has a low or normal TSH level. And the FT4/FT3 may not be "fine", even if it is within the lab's range. If you have his result and the lab's range, post it here if you'd like us to take a look.
Oops... Edit because I forgot to give you a link about this... http://www.shands.org/health/informa...cle/000324.htm