Ms. Yu, 55 years old, felt dizzy half a month ago. At first, Ms. Yu thought she had not rested well, but her dizziness did not improve even after resting for several days. Although there was no other symptom, Ms. Yu was still uneasy and had a local CT of her brain to find a tumor in her brain. At the suggestion of the doctor, Ms. Yu had a further MRI examination and found that the tumor in the brain was already more than 4 centimeters in size. Such a big tumor in the brain, how come Ms. Yu did not feel it before? Why did Ms. Yu not feel it before? Why did she only have dizziness when the brain tumor was so big? It turns out that Ms. Yu’s tumor is in the deep intracerebroventricular region of the brain, which is where the cerebrospinal fluid is normally located, and Ms. Yu’s tumor is growing in this area. As the tumor grew further, the space where the cerebrospinal fluid was located was no longer enough for the tumor to grow, so Ms. Yu slowly developed dizziness. Since the location of the tumor did not compress the functional areas such as motor and speech, Ms. Yu only showed symptoms of dizziness without localized signs of neurological impairment such as motor and speech. Ms. Yu underwent microscopic resection of the ventricular tumor, which grew deep in the area, the blood supply of the tumor was located in the deep surface, and the texture of the tumor was also tough, all of which increased the difficulty of the surgery. After several hours of surgery, the tumor in Ms. Yu’s brain was successfully removed. Fortunately, this is a benign meningioma, which has a small chance of recurrence after complete surgical removal, and does not require late radiotherapy and regular review in the future. Because of the slow growth rate of benign brain tumor, if the growth process does not compress the nerves and other structures, the symptoms may not be obvious in the early stage of tumor growth. And when the tumor increases in size to gradually grow and show symptoms such as increased intracranial pressure, the tumor already has a certain volume.