目的：原发中枢的淋巴瘤复发后的预后不良。

Purpose: The prognosis of relapsing primary CNS lymphoma (PCNSL) is poor.

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背景及目的：新近研究显示中枢神经系统损伤后可以再生，而这种结构重建是功能重组的基础。

Background and object: Recent research shows that central nervous system can regenerate itself following injury which is the basis of functional reorganization.

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由于成熟神经细胞缺乏再生能力，中枢神经系统损伤后自我修复能力很差。

Due to the deficiency of the regeneration in the mature neurons, central nervous system has poor self-repair capability after injury.

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