My friend's mother was misdiagnosed by an oncologist. [View all]

He mistook aspergelosis/fungal disease for Stage IV melanoma in three organs, including the brain.* My friend's mother was prescribed immediate radiation therapy (7 sessions) to her brain before she got her second opinion (with confirmation).

My question: what kind of temporary or permanent damage would seven sessions of radiation do to a 70 year old woman?

* This has been known to happen before. In 1974, Bing Crosby had a benign tumor the size of an orange, along with 2/3 of his right lung surgically removed. It was later determined that it wasn't cancer by a "life-threatening fungal infection" he caught on a safari.