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.
Character Bio. The youngest of the three Baratheon brothers, Renly believes he will be a better king than his brother Stannis or his nephew Joffrey. With the backing of his close companion Ser Loras Tyrell, he aims to prove it.