Hi! Of course, not a replacement for medical professionals, but I do have some experience with this. I have a thickened infundibulum, which is also called the pituitary stalk. It connects the pituitary gland and hypothalamus. My condition was caused by a relatively rare disease called LCH, which I’ve had on and off since childhood. Chances are that isn’t the cause. A few questions, if you feel comfortable answering:
1. How old are you? Certain conditions can be more common than others during certain age ranges.
2. What prompted you to get a MRI (I presume)? This could offer some clues.
3. Did your doctor note anything about your pituitary gland?
4. Do you have a history of any cardiovascular disease, such as high blood pressure or aneurysms elsewhere in body?

For me, I mainly had symptoms of hormone deficiencies due to pituitary damage, which are (mainly) under control, and headaches. You could look up conditions such as hypothyroidism, diabetes insipidus, adrenal insufficiency, or low testosterone. If your symptoms match any of these conditions, it could indicate pituitary involvement.

Overall, there is a good chance it’s just a benign process, whether congenital or acquired due to age or health conditions. Definitely talk to your doctor about pinpointing the reason. If your doctor doesn’t seem to care, absolutely get a second opinion.

I hope everything is well with you. Feel free to ask more questions if you want.

Zach