Your cortisol is very low.....
There are a few other reasons the pituitary can dysfunction like Sheehan's syndrome,etc. but just know that a tumor isn't the only reason the pituitary may be the cause of secondary adrenal insufficinecy
Adrenal insufficiency can be caused from damage to the adrenal glands, a non working pituitary gland due to tumor or infection, or hypothalamic dysfunction which prevents a signal going to the pituitary gland to in turn signal the adrenal glands to work. Adrenal insufficiency has many faces and differing symptoms with different causes but overall the end result is the same.
It could be secondary - if your ACTH tests hold that up and you have a pituitary tumor.
Primary means the source is adrenal, secondary means pituitary source.
Think of the pituitary as the radio tower and the adrenals as the radio. In primary, the radio is shut off and the tower then tries harder to reach the radio. Pituitary tests are then higher and cortisol tests lower. Stim tests show no increased result as the adrenal is diseased.
If the pituitary is at fault, the tower is not signaling the radio. Both can be low but a stim can can, as it is the simulated pit hormone, make the cortisol rise if the adrenals have not atrophied.
Both are treated the same way.
Does this help?