脑干包括中脑、桥脑和延髓,是大部分颅神经核集中的地方,也是运动及感觉神经束的传导径路。脑干内网状结构与意识有关,并有许多维持机体生命活动的重要中枢。因此脑干发生肿瘤可出现复杂的症状和体征,在治疗上也有其特点。脑干肿瘤由于解剖部位特殊,很少有人采用手术治疗,外科切除将不可避免地损伤这些重要结构。因此,放射治疗势必成 The brainstem includes the midbrain, pons and the medulla, which is where most cranial nerves are concentrated, as well as the conduction pathways of the motor and sensory nerve bundles. The reticular formation in the brainstem is related to consciousness, and there are many important centers that maintain the life activities of the body. Therefore, tumors in the brain stem can have complex symptoms and signs, and they also have features in their treatment. Due to the special anatomical site, brain stem tumors rarely use surgical treatment. Surgical resection will inevitably damage these important structures. Therefore, radiation therapy is bound to become