1. Clinical background: A 70-year-old man presented with a progressively enlarging but asymptomatic skull mass for the past 2 years. The mass was soft, non-tender, and had indistinct borders. There was also bilateral neck lymphadenopathy on clinical examination. Neurologically, he was alert, well-oriented and had no deficits. A CT scan of the chest, abdomen, and pelvis was unremarkable. Contrast enhanced MRI was performed (Fig. 1).
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