A 64-year-old man presents with a 6-week history of progressive cognitive decline, memory loss, behavioural disinhibition, and gait imbalance. He has developed early-morning headaches (relieved by vomiting), focal seizures with secondary generalisation, and right hemiparesis. Examination reveals frontal lobe signs (grasp reflex, perseveration), bilateral papilledema, and bilateral upgoing plantars. Gadolinium-enhanced MRI brain is shown. The structure marked **A** in the diagram—the heterogeneously enhancing mass crossing the corpus callosum with bilateral frontal lobe extension—demonstrates the classic "butterfly glioma" configuration. Based on the imaging characteristics and clinical presentation, what is the most likely diagnosis?
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