Typical case: The patient, female, 54 years old, was admitted to the hospital with the chief complaint of “visual double vision for 3 months, headache with nausea and vomiting for 4 days”. History: The patient was admitted to the hospital on March 20, 2015 with the following complaints: visual double vision with no obvious cause 3 months ago, no blurred vision, no eye movement disorder, no headache, dizziness, no nausea, vomiting, etc. No special treatment was given. Four days ago, the patient had a headache without any obvious cause, and the pain was persistent and intermittently aggravated, the range was not fixed, the pain was unbearable, accompanied by nausea and vomiting, and the vomiting was stomach contents, followed by emergency cranial CT at the local county hospital, suggesting intracranial occupancy. Subsequently, he was transferred to the local Linyi Hospital for cranial MRI: right pontocerebellar junction and anterior pontine pool occupancy. In order to seek further surgical treatment, he came to our hospital and was admitted to the neuro-oncology surgery department as “intracranial occupancy”. Since the onset of the disease, the patient had a clear consciousness, good mental diet, good night sleep, and normal bowel movements. She had a history of total zygoma and ovarian cystectomy, and her menstrual history was normal. Family history was denied. Admission examination: (2015-03-19) Beijing Tiantan Hospital of Capital Medical University showed that the slope is right-sided bone destruction, the right pontocerebellar angle, the anterior pontine pool can be seen in a mass of mixed high-density shadow, the foci of point-like calcification can be seen within the boundary is clear, the size of the surrounding 29mm * 28mm, the brainstem four ventricles pressure deformation, the morphology of the supratentorial ventricles can be. The diagnosis was: right pontocerebellar horn and anterior pontine pool chordoma. The tumor tissue was grayish red, soft, uneven in texture, and clearly demarcated from the surrounding area, and the tumor was completely excised under the microscope. After surgery, the patient’s consciousness was clear, his speech was fluent, his answers were tangential, his pupils were equal in size and rounded bilaterally, and his direct and indirect reflexes were sensitive. There was no significant improvement in visual double vision. The gross hearing was normal, the voice was not hoarse, and there was no swallowing difficulty or choking cough. The cranial CT at 5 hours postoperatively showed that there was no significant bleeding in the operated area, subdural or epidural. On the 8th day after surgery, the patient developed fever up to 39.2 degrees C. A lumbar puncture cerebrospinal fluid examination showed that the total cell count was 1099, leukocytes 1099, polymorphonuclear cells 91%, mononuclear cells 9%, and biochemical examination returned: protein 0.68 g/L. The patient was considered to have intracranial infection and was given The patient was treated with anti-infective drugs (intravenous drip + intrathecal injection) and the changes of cerebrospinal fluid were monitored, and after half a month, the cerebrospinal fluid examination indicated normal, no fever and headache symptoms, and no change of visual repercussion symptoms. The postoperative changes and irregular short-length mixed T1 isometric mixed T2 signal were seen in the right sigmoid sinus. As shown in the figure below: The patient is now recovering well, no significant changes in visual repercussions, no special treatment, the patient and his family were more satisfied with the treatment and requested to be discharged, so he was discharged on April 19, 2015, and continued to be followed up by telephone after discharge.