A 62-year-old man presents with progressive morning headaches and vomiting over 4 weeks, followed by a focal seizure. MRI with gadolinium shows a heterogeneous ring-enhancing mass with central necrosis and surrounding vasogenic edema. The structure marked **C** in the diagram demonstrates crossing of the corpus callosum in a characteristic butterfly pattern. Which of the following clinical features is MOST consistent with this imaging finding and best explains why this appearance is pathognomonic for the underlying diagnosis?
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