A 38-year-old Indian woman presents with a 18-month history of progressive cognitive decline, personality changes, and intermittent headaches. MRI brain shows a left temporal lobe mass that is isointense to gray matter on T1, hyperintense on T2/FLAIR, with minimal enhancement and no significant edema. Histology reveals uniform, well-differentiated astrocytes with mild nuclear enlargement, sparse mitotic figures, and no necrosis. FISH analysis shows IDH1 mutation (R132H positive). What is the most likely diagnosis?

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