The pituitary gland is a part of the brain that makes and controls hormones. A tumor in the pituitary gland is an abnormal growth that can inhibit its ability to function correctly. Pituitary tumors have three main types: benign, invasive adenoma (benign tumors that have spread to the bones), and carcinoma (cancer). Genetics can play a role in some pituitary tumors as well as certain conditions. Treatments may include surgery, radiation, and more. Follow the links below to find WebMD's comprehensive coverage about how a pituitary tumor is caused, what it looks like, how to treat it, and much more.