A subdural hematoma is most commonly caused by a severe injury to the head.

硬膜下血肿几乎都是因为严重的脑损伤引起的。

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In most cases such procedures are needed because of severe bone loss due to injury, illness or surgical treatment of conditions such as head and neck cancer.

大多数情况下这种过程因为受伤、疾病或头颈癌等病状的手术治疗所产生的严重骨骼缺失而是必须的。

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With the increasing use of radiotherapy for head and neck cancers, the incidence of radiation brain injury has markedly increased. Radiation brain injury becomes one of the most severe complications.

随着头颈部肿瘤放射治疗技术的日渐推广，放射性脑损伤的发病率逐年增高，是放射治疗最严重的并发症之一。

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With the increasing use of radiotherapy for head and neck cancers, the incidence of radiation brain injury has markedly increased. Radiation brain injury becomes one of the most severe complications.

随着头颈部肿瘤放射治疗技术的日渐推广，放射性脑损伤的发病率逐年增高，是放射治疗最严重的并发症之一。

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