There are 4 primary x-ray tests to examine the adrenal glands (and the rest of the abdomen) for the presence of a tumor (the word "tumor" simply means "mass". Tumors can be benign or malignant).
Pheochromocytomas are often referred to as the "ten percent tumor" because they do many things about ten percent of the time. The following is a fairly exhaustive list of these characteristics: