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However, he developed left-sided hemiplegia on Day 306. Head MRI revealed a new lesion and a growing lesion, presenting as ring-enhanced nodules. Brain biopsy was performed, and a pathologic diagnosis of Epstein-Barr virus-associated CNS-PTLD was made. There was no evidence of TE. He was treated successfully by reducing immunosuppressants, followed by rituximab administration and a donor lymphocyte infusion, resulting in complete remission. While T.gondii-specific PCR has great value for diagnosis of TE, CNS-PTLD can be diagnosed only by brain biopsy; hence