An MRI scan depicted a space-occupying lesion in the left middle cerebellar peduncle and cytologic study of the cerebrospinal fluid disclosed lymphoma cells.

• 核磁共振检查发现左侧中小脑角有一病变。脑脊髓液的细胞学检查发现淋巴癌细胞，证实中枢神经系统转移。