Maybe nothing: There are physiologic reasons why the pituitary may swell, such as pregnancy, hypothyroidism, adolescence. The questions i would ask: is there any hormone disorder? Is there any other abnormality noted on the mri? Was this a "pituitary mri"? Did the radiologist misinterpret this? Many questions. See an endocrinologist, certainly before anything invasive is done.
Answered 4/7/2013
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