To treat a pituitary tumor with radiation, doctors may use a variety of techniques depending on the size and location of the tumor. Conventional radiation covers a wide area in and around the tumor and is usually given daily for several weeks.
In the show, Stannis Baratheon dies under the sword of Jamie Lannister, wielded by a woman to fulfill a promise to Catelyn Stark, to avenge the death of Renly Baratheon. You can state he died of internal complications.
Warren Simon (Ted Atherton) (Season 2): Warren is the dean of Blue Mountain State. He was a nerd in his youth and resents Coach Daniels. He tried to humiliate Alex by holding a banquet in his honor and giving a speech on a paper he knows Alex didn't write, and he convinces the nerds to turn on the jocks.