What is the fine-grained topic of the following text: When an MRI revealed the large tumor in her brain, she says “it was a relief to find out what was really going on.” By that point, the grade 2 oligoastrocytoma had intertwined itself with healthy tissue, causing problems with her speech as she struggled to find the right words in a “noisy” brain. Only return the topic.
Brain tumor diagnosis and effects on speech