My former endocrinologist told me that i was likely going to develop cancer from several mris i have had to follow a pituitary adenoma and benign liver tumor. are mris causing cancer in patients?

Unlikely : Mris do deliver quite a bit of radiation but i think the dr was trying to discourage you from wanting more, but not in a way i would!

MRI CAUSES CANCER ?: No idea if it does. Mri are still being used a lot for dx.

Nonsense: Mris use powerful magnets to harmlessly and temporarily change the orientation of atoms in your tissues. They then use radio waves to visualize the image. The change of atom spin and orientation has no effect on the molecules or their function. The type of radiation that causes cancer is ionizing radiation. You get exposed to that with ct scans, xrays, air travel, etc. But not mris. Fear not.