If this is a primary brain tumor, possibilities include medulloblastoma (rare, but does occur in older individuals) and small cell variant of glioblastoma.

• 如果这是原发于脑的肿瘤，可能的诊断是髓母细胞瘤（罕见，但确实可以在老年人中出现）和胶质母细胞瘤的小细胞变异型。