If i was your doctor i will advise you to get your MRI
done to confirm it that u have shrunken pituitary gland
. Pituitary gland is a small gland located at the base of the brain that controls various other glands of the body like thryoid, adrenals, ovaries etc. As you are born without a thyroid
gland and have low cortisol
levels already the shrunken pituitary wont affect your condition and worsen your symptoms as long as you keep taking the hormones externally in form of medications.