患者,男,13岁因头痛三年并加重二个月,以颅内占位性病变入院。三年以来,枕部一“疖肿”常发炎,亦与头痛出现有关,每次“流脓”前头痛加重,“流脓”后头痛缓解。每1～2月上述现象发生一次。近二月头痛加重为持续性,伴喷射状呕吐,视力障碍和行路不稳。体检:反应迟钝,头围增大,步履蹒跚,枕外粗隆右上方有一疖肿,有少许脓性分泌物。闭目直立试验向右侧倾倒,双侧视神经乳头水肿,头颅X光片示外形增大,脑回压迹增多加深,脑室造影示双侧脑室及三脑室明显扩大,四脑室不显影。枕部炎症消退后开颅检查。手术所见:枕后正中切口进颅,肿块位于右小脑 Patients, male, 13 years old due to headache for three years and increased two months to intracranial space-occupying lesions admitted. Three years, the occipital a “swollen” often inflammation, but also with the emergence of headaches, each “emptiness” increased headache, “pus” headache relief. The phenomenon occurs once every January to February. Headache increased in recent months as persistent, with jet-like vomiting, visual impairment and road instability. Physical examination: unresponsive, head circumference increases, walking hobbled, occipital tuberosities have a swollen right upper right swollen, a little purulent discharge. Eyes closed upright test to the right dumping, bilateral optic papillae edema, skull X-ray showed increased shape, deepened deepened backtrack, ventriculogram showed double ventricle and third ventricle significantly enlarged, four ventricle is not developing. Occipital inflammation subsided after craniotomy. Surgical findings: the middle of the occipital incision into the skull, mass located in the right cerebellum