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目的：阐明脑单发低密度病灶的实质．材料与方法：收集26例进行CT与病理对照研究。结果：该类病灶以低级别胶质瘤最多见，还可见于病毒性脑炎、皮样囊肿及脑软化等。低密度改变与组织学上细胞密度低、细胞核染色质不丰富及间质内空泡多一致。结论：低密度的实质是DNA含量低及水含量高，不强化与血供不丰及血脑屏障完整有关，预后多较好。
Objective: To elucidate the essence of single low-density brain lesions. Materials and Methods: 26 cases were collected for CT and pathological control study. Results: This type of lesion is the most common in low grade gliomas. It is also found in viral encephalitis, dermoid cysts and brain softening. Low-density changes and histology, low cell density, chromatin is not rich in nuclear and interstitial vacuoles more consistent. Conclusion: The essence of low density is low DNA content and high water content. It is not related to incomplete blood supply and integrity of the blood-brain barrier. The prognosis is better.