1 MCQs in Medicine for NEET PG
A 62-year-old right-handed man presents with 6 weeks of progressive morning headaches, nausea, a new focal-onset seizure, personality changes, and right-sided pyramidal weakness. Fundoscopy reveals bilateral papilloedema. MRI brain with gadolinium shows a heterogeneous mass centered in the splenium of the corpus callosum with a classic 'butterfly' configuration crossing the midline to involve both cerebral hemispheres. The structure marked **A** in the diagram—the ring-enhancing mass crossing the corpus callosum—demonstrates irregular thick rim enhancement around central necrosis with extensive surrounding vasogenic edema. MR spectroscopy shows elevated Cho:NAA ratio and lipid-lactate peaks. Based on this imaging signature, what is the most likely diagnosis?
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