Had a MRI and it showed mild sphenoid sinus fluid. Headache, pressure, eye pain, dizziness, balance have been my issues. At the same time my menstrual cycle has changed from 28 days apart to 45 plus days apart. I m 36 my doctor took some blood work and my TSH was low. She is thinking my thyroid is hyper but wants to do a follow up blood test in 6 weeks. My question is would the MRI show the pituitary gland if I have fluid in my sphenoid sinus? TSH .446 T4, Free 1.2 ng/dL T3 Total 82 ng/dl